5-methyl-6-phenyl-4,5-dihydro-2h-pyridazin-3-one derivative

ABSTRACT

wherein R1 to R4 are hydrogen atom, halogen, or etc., Y is optionally-substituted alkylene group or etc.

TECHNICAL FIELD

The present invention may relate to a5-methyl-6-phenyl-4,5-dihydro-2H-pyridazin-3-one derivative havingantitumor activity, in particular, antitumor activity in brain.

BACKGROUND ART

Since nitrogen mustard was clinically used as an antineoplastic drug inthe 1940s for the first time in the world, many antitumor drugs havebeen developed until now. Many of these antitumor drugs, however, canalso exhibit cytotoxic action to normal cells, and thereby can showsevere side-effects such as gastrointestinal dysfunction,myelosuppression, and hair loss. Therefore, most of these antitumordrugs are limited to the usage, and often show partial and short-termeffects. Along with the recent developments in molecular biology, it hasbeen tried to identify more highly tumor-selective molecular targets toimprove the effect and side-effect, and such trials have attained someprogress. However, the positive effects are not so expected in tumorswhich have low express/contribution of molecular targets, and theside-effects are not low as desired. Thus, it has been desired todevelop novel drugs.

Some antitumor drugs having a phenyldihydropyridazinone moiety which thepresent invention comprises are known, but all those structures aredifferent from that of the present invention (Patent Literature 1 andPatent Literature 2).

CITATION LIST Patent Literature

[PL 1] WO 2009/114993

[PL 2] WO 2014/164704

SUMMARY OF INVENTION Technical Problem

The main purpose of the present invention is to provide a compoundhaving a potent anticancer effect, low side-effects, which is expectedto have good water-solubility.

Solution to Problem

The present inventors have extensively studied and then have found thata novel compound represented by the following formula (1) has a potentantitumor activity, particularly antitumor activity in brain. Based uponthe new findings, the present invention has been completed. The presentinvention provides 5-methyl-6-phenyl-4,5-dihydro-2H-pyridazin-3-onederivative represented by the following formula (1) or apharmaceutically acceptable salt thereof (hereinafter, sometimesreferred to as “the present compound”). The present invention mainly ismentioned below.

(Term 1) A compound of formula (1):

or a pharmaceutically acceptable salt thereof

wherein

R¹ to R⁴ are independently hydrogen atom, halogen, OH, CN, C₁₋₆ alkylgroup, halogenated C₁₋₆ alkyl group, C₂₋₆ alkenyl group, C₁₋₆ alkoxygroup, or halogenated C₁₋₆ alkoxy group provided that one or two of R¹to R⁴ are hydrogen atoms, but it is not that all of three or fourthereof are hydrogen atoms, and

Y is C₁₋₆ alkylene or C₂₋₆ alkenylene group, wherein the alkylene oralkenylene group may be substituted with one or more substituentsselected independently from the group consisting of C₁₋₆ alkyl group,halogen, and halogenated C₁₋₆ alkyl group, further wherein asubstitutable carbon atom in the substituent bonding to the alkylene oralkenylene group and another substitutable carbon atom in the alkyleneor alkenylene group, or two substitutable carbon atoms in thesubstituent bonding to the alkylene or alkenylene group may be combinedtogether to form a 3- to 6-membered carbon ring.

(Term 2) The compound of Term 1 or a pharmaceutically acceptable saltthereof, wherein any two of R¹ to R⁴ are hydrogen atoms.

(Term 3) The compound of Term 1 or 2 or a pharmaceutically acceptablesalt thereof, wherein R¹ to R⁴ are independently hydrogen atom, halogen,OH, CN, C₁₋₄ alkyl group, halogenated C₁₋₄ alkyl group, C₂₋₄ alkenylgroup, C₁₋₄ alkoxy group, or halogenated C₁₋₄ alkoxy group.

(Term 4) The compound of Term 1 or 2 or a pharmaceutically acceptablesalt thereof, wherein R¹ to R⁴ are independently hydrogen atom, fluorineatom, chlorine atom, OH, CN, C₁₋₄ alkyl group, vinyl group, or C₁₋₄alkoxy group.

(Term 5) The compound of any one of Terms 1 to 4 or a pharmaceuticallyacceptable salt thereof, wherein the alkylene or alkenylene group in Yis substituted with one or more substituents selected independently fromthe group consisting of C₁₋₄ alkyl group, halogen, and halogenated C₁₋₄alkyl group, further wherein a substitutable carbon atom in thesubstituent bonding to the alkylene or alkenylene group and anothersubstitutable carbon atom in the alkylene or alkenylene group, or twosubstitutable carbon atoms in the substituent bonding to the alkylene oralkenylene group may be combined together to form a 3- to 6-memberedcarbon ring.

(Term 6) The compound of any one of Terms 1 to 4 or a pharmaceuticallyacceptable salt thereof, wherein a carbon atom of the alkylene oralkenylene group in Y is substituted with one or two substituentsselected independently from the group consisting of C₁₋₄ alkyl group andhalogenated C₁₋₄ alkyl group, further when the carbon atom issubstituted with two substituents, each substitutable carbon atom in thetwo substituents may be combined together to form a 3- to 6-memberedcarbon ring.

(Term 7) The compound of any one of Terms 1 to 4 or a pharmaceuticallyacceptable salt thereof, wherein the alkylene or alkenylene group in Yhas no substituent.

(Term 8) The compound of any one of Terms 1 to 7 or a pharmaceuticallyacceptable salt thereof, wherein the compound of formula (1) isrepresented in the following formula.

(Term 9) The compound of Term 1 or a pharmaceutically acceptable saltthereof, which is selected from the following compounds:

Example 1:6-[3-bromo-5-chloro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 2:6-[3,5-dichloro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 7:6-[3-chloro-5-fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 12:6-[3-bromo-2-fluoro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 19:6-[3-chloro-2-fluoro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 22:6-[3-chloro-2-fluoro-4-(3-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 24:6-[3-bromo-2-fluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 26:6-[3-bromo-5-fluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 31:6-[3-chloro-4-(2-hydroxy-2-methylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 36:6-[3-chloro-2-fluoro-4-(2-hydroxy-2-methylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 40:6-{3-chloro-4-[(2R)-2-hydroxypropoxy]-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 44:6-{3-chloro-4-[(1-hydroxycyclopropyl)methoxy]-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 47:6-{3-chloro-2-fluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 48:6-[3-bromo-2-fluoro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 53:6-[3,5-dichloro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 54:6-[3-chloro-2-fluoro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 55:6-[3-chloro-4-(2-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 57:6-[3-bromo-5-chloro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 59:6-[2-fluoro-4-(2-hydroxypropoxy)-3-vinylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 64:6-[3-chloro-2-fluoro-4-(2-hydroxybutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 69:6-[3-bromo-5-fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 72:6-[3-chloro-4-(3-hydroxy-2,2-dimethylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 99:6-[3-chloro-5-fluoro-4-(4-hydroxy-2,2-dimethylbutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 100:6-[3,5-dichloro-4-(4-hydroxy-2,2-dimethylbutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 109:6-[3,5-dichloro-4-(2,2-difluoro-3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 112:6-[3-bromo-4-(2,2-difluoro-3-hydroxypropoxy)-2-fluorophenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 113:6-[3-chloro-4-(2,2-difluoro-3-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 118:(5R)-(−)-6-[3-chloro-2-fluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 120:(5R)-(−)-6-[4-(2,2-difluoro-3-hydroxypropoxy)-2-fluoro-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 124:(5R)-(−)-6-[2,3-difluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 125:(5R)-(−)-6-[3-fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 127:(5R)-(−)-6-[3-bromo-5-chloro-4-(3-hydroxy-2,2-dimethylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 131:6-[3-chloro-2,5-difluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 137:6-[3-chloro-2-fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 140:6-[3-chloro-2,5-difluoro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 142:6-[3-chloro-4-(3-hydroxy-2-methylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 148:6-[3-chloro-2-fluoro-4-(2-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 151:6-{3-chloro-2-fluoro-4-[(Z)-4-hydroxy-2-butenyloxy]-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 155:6-(3-chloro-4-{[(1S*,2R*)-2-(hydroxymethyl)cyclopropyl]methoxy}-5-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 159:6-[3-chloro-4-(2,2-difluoro-3-hydroxypropoxy)-2-fluoro-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 160:6-[4-(2,2-difluoro-3-hydroxypropoxy)-2-fluoro-3,5-dimethylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 167:6-{3-chloro-2-fluoro-4-[(1-hydroxycyclopropyl)methoxy]-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 168:6-{3-bromo-2-fluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one,

Example 170:6-{3,5-dichloro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one,and

Example 184:6-[2-fluoro-4-(2-hydroxy-2-methylpropoxy)-3-(trifluoromethyl)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one.

(Term 10) A pharmaceutical composition comprising the compound of anyone of Terms 1 to 9 or a pharmaceutically acceptable salt thereof.

(Term 11) An agent for treating malignant tumor, comprising the compoundof any one of Terms 1 to 9 or a pharmaceutically acceptable saltthereof.

(Term 12) A method for treating or preventing malignant tumor,comprising administering a therapeutically effective amount of thecompound of any one of Terms 1 to 9 or a pharmaceutically acceptablesalt thereof to a patient in need thereof.

(Term 13) The pharmaceutical composition of Term 10 for use in treatingor preventing malignant tumor.

(Term 14) Use of the compound of any one of Terms 1 to 9 or apharmaceutically acceptable salt thereof in the manufacture of an agentfor treating malignant tumor.

Preferably, the malignant tumor defined in the above Terms 11 to 14 isparticularly brain tumor.

Effect of Invention

The compound of the present invention can be a useful agent for treatingtumor, particularly malignant tumor, in more detail, the compound isuseful as a novel agent for treating childhood brain tumor selected fromthe group consisting of astrocytoma, malignant medulloblastoma, germcell tumor, craniopharyngioma, and ependymoma; adult brain tumorselected from the group consisting of glioma, meningioma, pituitaryadenoma, and nerve sheath tumor; head and neck cancer selected from thegroup consisting of maxillary sinus cancer, pharyngeal cancer (e.g.nasopharyngeal cancer, oropharyngeal cancer, hypopharyngeal cancer),laryngeal cancer, oral cancer (e.g. lip cancer, tongue cancer), andsalivary gland cancer (e.g. parotid gland cancer); thoracic cancer andtumor selected from the group consisting of small cell lung cancer,non-small-cell lung cancer, thymoma, and mesothelioma; gastrointestinalcancer and tumor selected from the group consisting of esophagealcancer, liver cancer, primary liver cancer, gallbladder cancer, bileduct cancer, gastric cancer, colorectal cancer (e.g. rectal cancer, analcancer), pancreatic cancer, and pancreatic endocrine tumor; urologiccancer and tumor selected from the group consisting of penile cancer,renal pelvic/ureter cancer, renal cell cancer, testicular tumor (alsoreferred to as testicular neoplasm), prostate cancer, bladder cancer,Wilms' tumor, and urothelial carcinoma; gynecologic cancer and tumorselected from the group consisting of vulvar cancer, cervical cancer,uterine body cancer, endometrial cancer, uterine sarcoma,choriocarcinoma, vaginal cancer, breast cancer, ovarian cancer, andovarian germ cell tumor; adult and childhood soft tissue sarcoma; bonetumor selected from the group consisting of osteosarcoma and Ewing'stumor; endocrine tissue cancer and tumor selected from the groupconsisting of adrenocortical carcinoma and thyroid cancer; malignantlymphoma and leukemia selected from the group consisting of malignantlymphoma, non-Hodgkin's lymphoma, Hodgkin's disease, multiple myeloma,plasma cell neoplasm, acute myeloid leukemia, acute lymphoblasticleukemia, adult T-cell leukemia-lymphoma, chronic myeloid leukemia, andchronic lymphocytic leukemia; or skin cancer and tumor selected from thegroup consisting of chronic myeloproliferative disorder, malignantmelanoma, squamous cell carcinoma, basal cell carcinoma, and mycosisfungoides. In particular, the compound of the present invention isexpected to have a high safety, for example, because the compound has nomyelosuppressive action or the like that is a frequently-occurringside-effect in using a conventional anti-malignant tumor agent. Inaddition, the compound has a good water-solubility, thus it is expectedto be used in the treatment via various administration ways.

DESCRIPTION OF EMBODIMENTS

The compound of the present invention may be in the form of hydrateand/or solvate, and hence the present compound also encompasses hydrateand/or solvate thereof.

The compound of the present invention may have one chiral carbon atom oroptionally more chiral carbon atoms. Unless otherwise indicated, thepresent compound also encompasses all stereoisomers thereof.

The compound of formula (1) may have a chiral carbon at 5th position ofits 4,5-dihydro-2H-pyridazin-3-one moiety. Unless otherwise indicatedhere, the compound of formula (1) may encompass all stereoisomers,preferably a stereoisomer having R configuration at 5th position.

In addition, the compound of formula (1) (deuterium form) in which anyone or more ¹H atoms are replaced by ²H(D) atoms is within the scope ofthe present invention.

There may exist a polymorphism in a crystal of the compound of formula(1) or a pharmaceutically acceptable salt thereof, and hence suchcrystal polymorphism is also within the scope of the present invention.

Each term used herein is explained below.

The term “halogen” herein means fluorine atom, chlorine atom, bromineatom or iodine atom. Preferably, it is fluorine atom or chlorine atom.

The term “alkyl group” herein means a saturated straight or branchedchain hydrocarbon group. For example, the “C₁₋₄ alkyl” or “C₁₋₆ alkyl”means an alkyl having 1-4 or 1-6 carbon atoms, respectively. The “C₁₋₄alkyl” includes, for example, methyl, ethyl, propyl, isopropyl, butyl,isobutyl, sec-butyl, and tert-butyl. The “C₁₋₆ alkyl” includes pentyl,isopentyl, neopentyl, and hexyl, besides the above C₁₋₄ alkyl.

The term “halogenated alkyl group” means an alkyl group in which one ormore replaceable hydrogen atoms are replaced by the same or differentand one or more halogen atoms. For example, the term “halogenated C₁₋₆alkyl group” means an alkyl group having 1-6 carbon atoms, in which oneor more replaceable hydrogen atoms are replaced by the same or differentand one or more halogen atoms, and it includes, for example,trifluoromethyl, pentafluoroethyl, 2-chloroethyl, 2-bromoethyl,heptafluoropropyl, 3-bromopropyl, nonafluorobutyl, tridecafluorohexyl,2,2,2-trifluoroethyl, 1,1-difluoroethyl, 1,1-difluoropropyl,1,1,2,2-tetrafluoropropyl, 3,3,3-trifluoropropyl, and2,2,3,3,3-pentafluoropropyl, and it is preferably trifluoromethyl.

The term “C₂₋₆ alkenyl group” means an unsaturated straight or branchedchain C₂₋₆ hydrocarbon group having 1-3 carbon-carbon double bonds.Preferably, it is “C₂₋₄ alkenyl group”. The “C₂₋₆ alkenyl group”includes, for example, ethenyl (i.e., vinyl group), propenyl, butenyl,pentenyl, and hexenyl.

The term “alkoxy group” means “alkyl-O— group”. For example, the “C₁₋₆alkoxy group” means “C₁₋₆ alkyl-O— group”, wherein the part “C₁₋₆ alkyl”is as defined in the above-defined “C₁₋₆ alkyl”. Preferably, it is “C₁₋₄alkoxy group”. The “C₁₋₆ alkoxy group” includes, for example, methoxy,ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, sec-butoxy, andtert-butoxy.

The term “alkylene group” means a saturated straight or branched chaindivalent hydrocarbon group. For example, the “C₁₋₆ alkylene group” meansan alkylene group having 1-6 carbon atoms. The “C₁₋₆ alkylene group”includes, for example, methylene, ethylene, propylene, butylene,1-methylpropylene, 2-methylpropylene, pentylene, 1-methylbutylene,2-methylbutylene, hexylene, 2-ethylbutylene, and 1,3-dimethylbutylene.

The term “alkenylene group” means an unsaturated straight or branchedchain divalent hydrocarbon group having 1 or more carbon-carbon doublebonds. For example, the “C₂₋₆ alkenylene group” means a C₂₋₆ alkylenegroup having 1-3 carbon-carbon double bonds. The “C₂₋₆ alkenylene group”includes, for example, ethynylene group, propynylene group, butynylenegroup, pentynylene group, and hexynylene group.

In the phrase “a substitutable carbon atom in the substituent bonding tothe alkylene or alkenylene group and another substitutable carbon atomin the alkylene or alkenylene group, or two substitutable carbon atomsin the substituent bonding to the alkylene or alkenylene group may becombined together to form a 3- to 6-membered carbon ring” in Y, the term“substitutable carbon atom in the substituent bonding to the alkylene oralkenylene group” means a substitutable carbon atom in the C₁₋₆ alkylgroup or the halogenated C₁₋₆ alkyl group which is selected as asubstituent of the alkylene or alkenylene group in Y, and the term “3-to 6-membered carbon ring” includes, for example, cyclopropyl,cyclobutyl, cyclopentyl, cyclohexyl, cyclobutenyl, cyclopentenyl,cyclohexenyl, and a halogenated product thereof.

The term “pharmaceutically acceptable salt” includes, as an acidaddition salt, an inorganic acid salt such as hydrochloride,hydrobromide, hydroiodide, sulfate, perchlorate, and phosphate, anorganic acid salt such as oxalate, malonate, maleate, fumarate, lactate,malate, citrate, tartrate, benzoate, trifluoroacetate, acetate,methanesulfonate, p-toluenesulfonate, and trifluoromethanesulfonate, andan amino acid salt such as glutamate and aspartate; and as a basic salt,an alkali metal salt such as sodium salt and potassium salt, analkaline-earth metal salt such as calcium salt, and ammonium salt.

General Process to Prepare the Present Compound

The above 4,5-dihydro-2H-pyridazin-3-one compound of formula (1) or asalt thereof can be prepared in a general manner of organic synthesis,for example, in the manner below, but the present invention should notbe limited thereto. Material compounds used herein may be obtained fromcommercially available products or prepared in a conventional manner asappropriate.

Wherein R^(1a) to R^(4a) are independently hydrogen atom, halogen, CN,C₁₋₆ alkyl group, halogenated C₁₋₆ alkyl group, C₂₋₆ alkenyl group, C₁₋₆alkoxy group, or halogenated C₁₋₆ alkoxy group, provided that one or twoof R^(1a) to R^(4a) are hydrogen atoms, but it is not that all of threeor four thereof are hydrogen atoms. X¹ denotes a leaving group. Y¹ isC₁₋₆ alkylene or C₂₋₆ alkenylene group, wherein the alkylene oralkenylene group may be substituted with one or more substituentsselected independently from the group consisting of C₁₋₆ alkyl group,fluorine group, and fluorinated C₁₋₆ alkyl group, further wherein asubstitutable carbon atom in the substituent bonding to the alkylene oralkenylene group and another substitutable carbon atom in the alkyleneor alkenylene group, or two substitutable carbon atoms in thesubstituent bonding to the alkylene or alkenylene group may be combinedtogether to form a 3- to 6-membered carbon ring.

According to the method shown in Scheme 1, Compound (1a) can be preparedby reacting Compound (2) and Compound (3), in an appropriate solvent orwithout a solvent, in the presence or absence of a basic compound.

The leaving group X¹ used herein includes halogen group such asfluorine, chlorine, bromine, and iodine; substituted sulfonyloxy groupsuch as C₁₋₆ alkylsulfonyloxy group (e.g. methanesulfonyloxy,ethanesulfonyloxy), C₆₋₁₄ arylsulfonyloxy group (e.g.benzenesulfonyloxy, p-toluenesulfonyloxy), and C₇₋₁₆ aralkylsulfonyloxygroup (e.g. benzylsulfonyloxy); acyloxy group such as acetoxy andbenzoyloxy; oxy group substituted with heterocyclyl or aryl such assuccinimide, benzotriazole, quinoline, and 4-nitrophenyl; andheterocyclyl such as imidazole.

The solvent used herein can be broadly chosen from known solvents unlessit negatively affects the reaction. The solvent used herein includes,for example, water; ethers such as dioxane, tetrahydrofuran (THF),diethyl ether, diethylene glycol dimethyl ether (diglyme), and ethyleneglycol dimethyl ether; aromatic hydrocarbons such as benzene, toluene,and xylene; halogenated hydrocarbons such as dichloromethane,dichloroethane, chloroform, and carbon tetrachloride; alcohols such asmethanol, ethanol, and 2-propanol; ketones such as acetone and methylethyl ketone; polar solvents such as N,N-dimethylformamide (DMF),dimethylsulfoxide (DMSO), hexamethylphosphate triamide, andacetonitrile; and a mixture thereof.

The basic compound used herein can be broadly chosen from known basiccompounds, which includes, for example, an alkali metal hydroxides suchas sodium hydroxide, potassium hydroxide, cesium hydroxide, and lithiumhydroxide; an alkali metal carbonates such as sodium carbonate,potassium carbonate, cesium carbonate, lithium carbonate, lithiumhydrogen carbonate, sodium hydrogen carbonate, and potassium hydrogencarbonate; an acetates such as sodium acetate and potassium acetate; analkali metals such as sodium and potassium; inorganic salts such assodium amide, sodium hydride, and potassium hydride; an alkali metallower alkoxides such as sodium methoxide, sodium ethoxide, and potassiumtert-butoxide; an organic bases such as triethylamine,diisopropylethylamine, tripropylamine, pyridine, quinoline,1,5-diazabicyclo[4.3.0]non-5-ene (DBN),1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), and1,4-diazabicyclo[2.2.2]octane (DABCO). These basic compounds may be usedas a single ingredient or in a combination of two or more ingredients.

If necessary, in the reaction, alkali metal iodide such as potassiumiodide and sodium iodide can be used as a reaction accelerator.

The amount of Compound (3) used herein is generally at least about 0.5mole, preferably about 0.5 to 10 moles per one mole of Compound (2). Theamount of the basic compound used herein is generally about 0.5 to 10moles, preferably about 0.5 to 6 moles per one mole of Compound (2). Theabove reaction is carried out generally at 0° C. to 250° C., preferablyat 0° C. to 200° C., under ordinary pressure or increased pressure, andthe reaction is completed in about 1 to 80 hours. In addition, thereaction can be carried out under microwave irradiation.

Wherein R^(1b) to R^(4b) are independently hydrogen atom, halogen, C₁₋₆alkyl group, halogenated C₁₋₆ alkyl group, C₂₋₆ alkenyl group, C₁₋₆alkoxy group, or halogenated C₁₋₆ alkoxy group, provided that one or twoof R^(1b) to R^(4b) are hydrogen atoms, but it is not that all of threeor four thereof are hydrogen atoms. Y² is C₁ alkyl or C_(m) alkenylgroup which has oxo group, wherein the alkyl or alkenyl group may besubstituted with one or more substituents selected independently fromthe group consisting of C₁₋₆ alkyl group, halogen, and halogenated C₁₋₆alkyl group, further wherein a substitutable carbon atom in thesubstituent bonding to the alkyl or alkenyl group and anothersubstitutable carbon atom in the alkyl or alkenyl group, or twosubstitutable carbon atoms in the substituent bonding to the alkyl oralkenyl group may be combined together to form a 3- to 6-membered carbonring, provided that the carbon atom to which the oxo group binds is notnext to the halogen atom or the oxygen atom between the benzene ring andY², and the oxo group is not bound to the olefin carbon. R⁵ is C_(n)alkyl group. X² is halogen atom. Y³ is C₃₋₆ alkyl or C₄₋₆ alkenyl groupwhich has hydroxy group, wherein the alkyl or alkenyl group may besubstituted with one or more substituents selected independently fromthe group consisting of C₁₋₆ alkyl group, halogen, and halogenated C₁₋₆alkyl group, further wherein a substitutable carbon atom in thesubstituent bonding to the alkyl or alkenyl group and anothersubstitutable carbon atom in the alkyl or alkenyl group, or twosubstitutable carbon atoms in the substituent bonding to the alkyl oralkenyl group may be combined together to form a 3- to 6-membered carbonring, provided that the carbon atom to which the hydroxy group binds isnot next to the halogen atom or the oxygen atom between the benzene ringand Y³, and the hydroxy group is not bound to the olefin carbon, and thehydroxy group is not primary alcohol. 1 is an integer of 2 to 5, m is aninteger of 3 to 5, and n is an integer of 1 to 4, provided that 1+n≤6,and m+n≤6.

According to the method shown in Scheme 2, Compound (1b) having hydroxygroup in Y³ can be prepared by reacting Compound (4) having oxo group inY² with Grignard reagent (R⁵MgX²) or lithium reagent (R⁵Li) in anappropriate inert solvent such as diethyl ether and THF.

The amount of the Grignard reagent (R⁵MgX²) or lithium reagent (R⁵Li) offormula (5) used herein is generally at least about 0.5 mole, preferablyabout 3 to 10 moles per one mole of Compound (4). The above reaction iscarried out generally at −78° C. to room temperature, preferably at 0°C. to room temperature, and the reaction is completed in about 1 to 24hours.

Wherein R¹ to R⁴ are as defined above. R⁶ and R⁷ are independentlyhydrogen atom, C₁₋₆ alkyl group, or halogenated C₁₋₆ alkyl group. R⁶ andR⁷ may be combined together at each substitutable carbon atom in R⁶ andR⁷ to form a 3- to 6-membered carbon ring.

According to the method shown in Scheme 3, Compound (1c) can be preparedby reacting Compound (6) and Compound (7), in an appropriate solvent, inthe presence of a basic compound.

The solvent used herein can be broadly chosen from known solvents unlessit negatively affects the reaction. The solvent used herein includes,for example, polar solvents such as DMF, DMSO, and acetonitrile; ketonessuch as acetone and methyl ethyl ketone; hydrocarbons such as benzene,toluene, xylene, tetralin, and liquid paraffin; alcohols such asmethanol, ethanol, 2-propanol, n-butanol, and tert-butanol; ethers suchas THF, dioxane, dipropyl ether, diethyl ether, and diglyme; esters suchas methyl acetate, ethyl acetate, isopropyl acetate, and tert-butylacetate; and a mixture thereof.

The basic compound used herein can be broadly chosen from known basiccompounds, which includes, for example the basic compounds listed inScheme 1.

The amount of Compound (7) used herein is generally about 0.5 to 5moles, preferably about 0.5 to 3 moles per one mole of Compound (6). Theamount of the basic compound used herein is generally about 0.1 to 5moles, preferably about 1 to 2 moles, per one mole of Compound (6).

The above reaction can be carried out, for example, as follows: Compound(6) is dissolved in a reaction solvent, a basic compound is added to thestirred solution under ice-cold or at room temperature, the reactionmixture is stirred at room temperature to 80° C. for 30 minutes to 1hour, Compound (7) is added thereto, and then the reaction mixture isstirred at generally room temperature to 100° C., preferably at 50 to80° C., for 30 minutes to 60 hours, preferably 1 to 50 hours.

Wherein R^(1c) to R^(4c) are independently hydrogen atom, halogen, OH,CN, C₁₋₆ alkyl group, fluorinated C₁₋₆ alkyl group, C₂₋₆ alkenyl group,C₁₋₆ alkoxy group, or fluorinated C₁₋₆ alkoxy group, provided that oneor two of R^(1c) to R^(4c) are hydrogen atoms, but it is not that all ofthree or four thereof are hydrogen atoms. R⁸ is C₁₋₆ alkyl group. Y¹ isas defined above.

According to the method shown in Scheme 4, Compound (1d) can be preparedby reacting Compound (8) and hydrazine, in an appropriate solvent, inthe presence or absence of an acidic compound.

The solvent used herein is an inert solvent, which includes, forexample, alcohols such as methanol, ethanol and 2-propanol; acetic acid;and water; preferably ethanol.

The hydrazine used herein is generally a hydrate thereof or a mineralacid salt thereof such as hydrochloride and sulfate. The amount ofhydrazine used herein is generally about one or more moles, preferablyabout 1 to 3 moles per one mole of Compound (8).

The reaction temperature is not limited in specific, which includes atemperature from room temperature to reflux temperature of the usedsolvent, and it is preferable to heat the reaction media to promote thereaction. The reaction time is generally 0.1 to 100 hours.

Wherein R¹ to R⁴ are as defined above. Y⁴ is C₁₋₆ alkyl or C₂₋₆ alkenylgroup which has oxo group, wherein the alkyl or alkenyl group may besubstituted with one or more substituents selected independently fromthe group consisting of C₁₋₆ alkyl group, halogen, and halogenated C₁₋₆alkyl group, further wherein a substitutable carbon atom in thesubstituent bonding to the alkyl or alkenyl group and anothersubstitutable carbon atom in the alkyl or alkenyl group, or twosubstitutable carbon atoms in the substituent bonding to the alkyl oralkenyl group may be combined together to form a 3- to 6-membered carbonring, provided that the carbon atom to which the oxo group binds is notnext to the halogen atom or the oxygen atom between the benzene ring andY⁴, and the oxo group is not bound to the olefin carbon. Y⁵ represents asubstituent in which the oxo group moiety of Y⁴ is reduced to a hydroxylgroup.

According to the method shown in Scheme 5, Compound (1e) having hydroxygroup in Y⁵ can be prepared by reacting Compound (9) having oxo group inY⁴ with a hydride reductant in an appropriate solvent.

The hydride reductant used herein includes, for example, sodiumborohydride, zinc borohydride, and these hydride reductants may be usedas a single ingredient or in a combination of two or more ingredients.The reduction with a hydride reductant may be generally carried out in asolvent. The solvent used herein includes, for example, water; alcoholssuch as methanol and 2-propanol; and ethers such as THF, diethyl ether,diisopropyl ether, and diglyme. These solvents may be used as a singlesolvent or in a combination of two or more solvents.

The reaction temperature is not limited in specific, which is generallyat −60 to 150° C., preferably at −30 to 100° C. The reaction time isgenerally 10 minutes to 15 hours.

Wherein R¹ to R⁴ are as defined above. Y⁶ is C₁₋₅ alkylene or C₂₋₅alkenylene group, wherein the alkylene or alkenylene group may besubstituted with one or more substituents selected independently fromthe group consisting of C₁₋₆ alkyl group, halogen, and halogenated C₁₋₆alkyl group, further wherein a substitutable carbon atom in thesubstituent bonding to the alkylene or alkenylene group and anothersubstitutable carbon atom in the alkylene or alkenylene group, or twosubstitutable carbon atoms in the substituent bonding to the alkylene oralkenylene group may be combined together to form a 3- to 6-memberedcarbon ring. R⁹ is C₁₋₆ alkyl group.

According to the method shown in Scheme 6, Compound (1f) can be preparedby reacting Compound (10) with a hydride reductant in an appropriatesolvent.

The hydride reductant used herein includes, for example,diisobutylaluminum hydride, sodium borohydride, and lithiumborohydride-trimethoxyborane. These reductants may be used as a singleingredient or in a combination of two or more ingredients. The amount ofthe hydride reductant used herein is generally at least equimolar toCompound (1f), preferably in the range of equimolar to 15 times molar.

The reduction reaction may be carried out in a suitable solvent, forexample, water; alcohols such as methanol, ethanol, and 2-propanol;ethers such as THF, diethyl ether, diisopropyl ether, and diglyme;halogenated hydrocarbons such as dichloromethane, chloroform, and carbontetrachloride; or a mixture thereof, at about −60° C. to 150° C.,preferably −30° C. to 100° C., generally for about 10 minutes to 40hours.

Wherein R^(1d) to R^(4d) are independently a leaving group, hydrogenatom, halogen, OH, CN, C₁₋₆ alkyl group, halogenated C₁₋₆ alkyl group,C₂₋₆ alkenyl group, C₁₋₆ alkoxy group, or halogenated C₁₋₆ alkoxy group,provided that at least one of R^(1d) to R^(4d) is a leaving group, oneor two thereof are hydrogen atoms, but it is not that all of three orfour thereof are hydrogen atoms. The leaving group includes chlorine,bromine, iodine, and a substituted sulfonyloxy group. Y is as definedabove. R^(1e) to R^(4e) are independently hydrogen atom, halogen, OH,CN, C₁₋₆ alkyl group, halogenated C₁₋₆ alkyl group, C₂₋₆ alkenyl group,C₁₋₆ alkoxy group, or halogenated C₁₋₆ alkoxy group, provided that atleast one of R^(1e) to R^(4e) is CN, one or two thereof are hydrogenatoms, but it is not that all of three or four thereof are hydrogenatoms. The leaving group in Compound (11) is replaced by CN at the sameposition in Compound (1g).

According to the method shown in Scheme 7, Compound (1g) can be preparedby reacting Compound (11) and a cyanating agent, in an appropriatesolvent, in the presence of a palladium compound.

The solvent used herein includes, for example, ethers such as THF,ethylene glycol dimethyl ether, tert-butyl methyl ether, and1,4-dioxane; aliphatic hydrocarbons such as hexane, heptane, and octane;aromatic hydrocarbons such as toluene and xylene; alcohols such asmethanol and ethanol; acid amides such as DMF and N-methyl-2-pyrrolidone(NMP); sulfoxides such as DMSO; and a mixture thereof, preferably DMF.

The cyanating agent used herein includes, for example, zinc cyanide, andthe palladium compound used herein include, for example,tetrakis(triphenylphosphine)palladium. The amount of cyanating agentused herein is generally 1 to 5 moles per one mole of Compound (11), andthe amount of palladium compound used herein is generally 0.01 to 0.5moles per one mole of Compound (11).

The reaction temperature is generally in the range of 50 to 200° C. Thereaction time is generally in the range of 0.5 to 24 hours. In addition,the reaction can be carried out under microwave irradiation.

Wherein R^(1f) to R^(4f) are independently hydrogen atom, halogen, OH,hydroxy group protected with a protecting group for hydroxy group(hereinafter, this is abbreviated as “protected hydroxy group”), CN,C₁₋₆ alkyl group, halogenated C₁₋₆ alkyl group, C₂₋₆ alkenyl group, C₁₋₆alkoxy group, or halogenated C₁₋₆ alkoxy group, provided that one or twoof R^(1f) to R^(4f) are hydrogen atoms, but it is not that all of threeor four thereof are hydrogen atoms. P¹ is a protecting group for hydroxygroup. When one or more of R^(1f) to R^(4f) are protected hydroxy group,the protecting group can be removed at the same time of the deprotectionof P¹. R¹ to R⁴, and Y are as defined above.

The protecting group for hydroxy group used herein is not limited unlessit negatively affects the reaction. The protecting group includes, forexample, a silyl protecting group (e.g. trimethylsilyl,tert-butyldimethylsilyl, triisopropylsilyl, tert-butyldiphenylsilyl), anacetal protecting group (e.g. tetrahydropyranyl (THP), methoxymethyl(MOM), methylthiomethyl, ethoxyethyl, benzyloxymethyl), and an acylprotecting group (e.g. acetyl, propionyl, pivaloyl, tert-butylacetyl,2-chloroacetyl, 2-bromoacetyl, trifluoroacetyl, trichloroacetyl,phthalyl, o-nitrophenoxyacetyl, benzoyl, 4-chlorobenzoyl, 4-bromobenzoylor 4-nitrobenzoyl).

According to the method shown in Scheme 8, Compound (15) can be preparedby reacting Compound (13) and Compound (14), in an appropriate solvent,in the presence of the Mitsunobu reagent and a phosphine.

The Mitsunobu reagent includes, for example, diethyl azodicarboxylateand bis(2-methoxyethyl) azodicarboxylate. The amount of Mitsunobureagent used herein is 1 to 10 moles, preferably 1 to 5 moles per onemole of Compound (13) shown in Scheme 8. The amount of Compound (14)used herein is 1 to 10 moles, preferably 1 to 5 moles per one mole ofCompound (13) shown in Scheme 8. The phosphine reagent used hereinincludes, for example, triphenylphosphine and tributylphosphine. Theamount of phosphine reagent used herein is 1 to 10 moles, preferably 1to 5 moles per one mole of Compound (13) shown in Scheme 8.

The solvent used herein is not limited unless it negatively affects thereaction. The preferred solvent used herein includes, for example,toluene, benzene, THF, 1,4-dioxane, DMF, N,N-dimethylacetamide, NMP,DMSO, and a mixture thereof.

The reaction temperature is generally at −78 to 200° C., preferably at 0to 50° C. The reaction time is generally 5 minutes to 3 days, preferably10 minutes to 10 hours.

According to the method shown in Scheme 8, Compound (1h) can be preparedby deprotecting Compound (15).

When the protecting group for hydroxy group is a silyl-type protectinggroup, the deprotection can be carried out by hydrolysis under an acidiccondition or by using a fluoride ion. For example, in case oftert-butyldimethylsilyl group selected as the silyl protecting group,the deprotection reaction is carried out with a fluoride ion. Suitablefluoride ion sources include, for example, tetrabutylammonium fluorideand hydrogen fluoride-pyridine, preferably tetrabutylammonium fluoride.The amount of the fluorine compound used herein is 1 to 10 moles,preferably 1 to 5 moles per one mole of Compound (15) shown in Scheme 8.

The solvent used herein is not limited unless it negatively affects thereaction. The solvent used herein includes, for example, THF,acetonitrile, and methylene chloride.

The deprotection reaction can be carried out at 0° C. to a refluxtemperature of the used reaction solvent, preferably 0° C. to roomtemperature. The reaction time is generally 5 minutes to 3 days,preferably 10 minutes to 10 hours.

When the protecting group for hydroxy group is an acetal protectinggroup such as a methoxymethyl group, the deprotection can be generallycarried out by using an acid hydrolysis condition. The “acid” used inthe acid hydrolysis includes, for example, acetic acid, hydrochloricacid and phosphoric acid, preferably hydrochloric acid. The amount ofthe acid is in the range of suitably 1 to 1000 moles, preferably 1 to 10moles per one mole of Compound (15) shown in Scheme 8.

The solvent used herein is not limited unless it negatively affects thereaction. The solvent used herein includes, for example,dichloromethane, methanol, and water.

The reaction time may vary depending on a material compound used herein,reaction temperature, or other factors, but it is suitably in the rangeof 0.5 hour to 24 hours.

When the protecting group for hydroxy group is an acyl-type protectinggroup, the deprotection can be generally carried out by using a basichydrolysis condition. The solvent used herein includes, for example,water; alcohols such as methanol, ethanol, 2-propanol, and tert-butanol;ketones such as acetone and methyl ethyl ketone; ethers such as diethylether, dioxane, THF, monoglyme, and diglyme; esters such as methylacetate and ethyl acetate; halogenated hydrocarbons such as chloroform,dichloromethane, dichloroethane, and carbon tetrachloride; DMSO; DMF;hexamethylphosphate triamide; and a mixture thereof. The basic compoundused herein includes, for example, carbonates such as sodium carbonate,potassium carbonate, sodium hydrogen carbonate, and potassium hydrogencarbonate; and metal hydroxides such as sodium hydroxide, potassiumhydroxide, calcium hydroxide, and lithium hydroxide. These basiccompounds may be used as a single ingredient or in a combination of twoor more ingredients.

The hydrolysis reaction can proceed generally at at 0 to 200° C.,preferably at 0 to 150° C., and the reaction is completed generally inabout 10 minutes to 50 hours.

When there are plural protecting groups for hydroxy group in R^(1f) toR^(4f) and P¹, the protecting groups may be the same or different. Ifthe protecting groups are different, the deprotection reaction can becarried out by combining plural deprotection conditions suitable foreach protecting group.

Wherein R^(1g) to R^(4g) are independently hydrogen atom, halogen,protected hydroxy group, CN, C₁₋₆ alkyl group, halogenated C₁₋₆ alkylgroup, C₂₋₆ alkenyl group, C₁₋₆ alkoxy group, or halogenated C₁₋₆ alkoxygroup, provided that at least one of R^(1g) to R^(4g) is protectedhydroxy group, one or two thereof are hydrogen atoms, but it is not thatall of three or four thereof are hydrogen atoms. R^(1h) to R^(4h) areindependently hydrogen atom, halogen, OH, CN, C₁₋₆ alkyl group,halogenated C₁₋₆ alkyl group, C₂₋₆ alkenyl group, C₁₋₆ alkoxy group, orhalogenated C₁₋₆ alkoxy group, provided that at least one of R^(1h) toR^(4h) is hydroxy group, one or two thereof are hydrogen atoms, but itis not that all of three or four thereof are hydrogen atoms. Protectedhydroxy group in Compound (17) is deprotected to OH at the same positionin Compound (1i). Y⁴ and Y⁵ are as defined above.

The reaction of Compound (16) and a hydride reductant can be carried outin a reaction condition similar to the reaction of Scheme 5.

The deprotection of Compound (17) can be carried out in a reactioncondition similar to the reaction of Scheme 8.

Wherein R^(1a) to R^(4a), and X¹ are as defined above. Y⁷ is C₂₋₆alkenyl group, wherein the alkenyl group may be substituted with one ormore substituents selected independently from the group consisting ofC₁₋₆ alkyl group, halogen, and halogenated C₁₋₆ alkyl group, furtherwherein a substitutable carbon atom in the substituent bonding to thealkenyl group and another substitutable carbon atom in the alkenylgroup, or two substitutable carbon atoms in the substituent bonding tothe alkenyl group may be combined together to form a 3- to 6-memberedcarbon ring. Y⁸ represents a group in which the double bond in thealkenyl group of Y⁷ is converted to an epoxy group Y⁹ represents a groupin which the epoxy group of Y⁸ is ring-opened.

The reaction of Compound (2) and Compound (18) can be carried out in areaction condition similar to the reaction of Scheme 1.

According to the method shown in Scheme 10, Compound (20) can beprepared by reacting Compound (19) and an oxidant in an appropriatesolvent or without a solvent. The oxidant used herein includes, forexample, m-chloroperbenzoic acid, peracetic acid, oxone, and hydrogenperoxide. The solvent used herein can be broadly chosen from knownsolvents unless it negatively affects the reaction. The solvent usedherein includes, for example, aromatic hydrocarbons such as benzene,toluene, and xylene; aliphatic hydrocarbons such as hexane and heptane;alcohols such as methanol and ethanol; halogenated solvents such aschloroform, dichloromethane, and dichloroethane; nitriles such asacetonitrile and butyronitrile; esters such as ethyl acetate, butylacetate, and methyl formate; amides such as DMF andN,N-dimethylacetamide; and a mixture thereof.

The amount of the oxidant used herein is generally about 1 to 5 molesper one mole of Compound (19). The above reaction is carried outgenerally at 0° C. to 100° C., preferably at 0° C. to room temperature,and the reaction is generally completed in about 0.5 to 24 hours.

According to the method shown in Scheme 10, Compound (1j) can beprepared by ring-opening Compound (20) under the hydrogenationcondition, in an appropriate solvent, in the presence of a palladiumcompound.

The reductant used herein includes, for example, hydrogen and ammoniumformate and these reductants may be used as a single ingredient or in acombination of two ingredients.

The palladium compound used herein include, for example,palladium-carbon (10% w/w). The amount of palladium compound used hereinis generally 0.01 to 0.5 moles per one mole of Compound (20).

The solvent used herein can be broadly chosen from known solvents unlessit negatively affects the reaction. The solvent used herein includes,for example, ethers such as dioxane, THF, diethyl ether, diglyme, andethylene glycol dimethyl ether; halogenated hydrocarbons such asdichloromethane, dichloroethane, chloroform, and carbon tetrachloride;alcohols such as methanol, ethanol, and 2-propanol; polar solvents suchas DMF, DMSO and acetonitrile; and a mixture thereof.

The above reaction is carried out generally at 0° C. to 70° C.,preferably at 0° C. to room temperature, and the reaction is generallycompleted in about 0.5 to 24 hours.

Wherein R¹ to R⁴, Y, and P¹ are as defined above.

The reaction of Compound (21) and hydrazine can be carried out in areaction condition similar to the reaction of Scheme 4. The deprotectionof Compound (22) can be carried out in a reaction condition similar tothe reaction of Scheme 8.

The present compound of formula (1) can be prepared according to theabove synthetic processes, and it can be also prepared based on thesynthetic processes described in the reference examples and examplesherein, considering the prior art known at the time of the filing date.

If necessary, the starting materials and intermediates shown in theabove schemes can be protected with a suitable protecting group beforestarting the reaction, and then the protecting group can be removed in aknown manner after the reaction.

Each product prepared according to the above schemes can be purifiedfrom each reaction mixture as follows, for example, the reaction mixtureis cooled, the reaction mixture is treated in an isolation proceduresuch as filtration, concentration, and extraction to isolate the crudeproduct, and the crude product is purified in a conventional manner ofpurification such as column chromatography and recrystallization.

The starting materials and products shown in each scheme also include asolvate thereof as an additional form, for example, a hydrate andethanolate.

The starting materials and products shown in each scheme may be used ina preferred salt form. Each product in each step can be used in its nextstep without isolation.

The present compound (1), intermediates prepared in the above schemes,and starting materials thereof may include geometric isomer,stereoisomer, tautomer and optical isomer thereof.

Each isomer can be isolated by a conventional manner. For example,racemic compounds can be divided by a general optical resolution such ascrystallization and chromatography to optically pure isomers thereof. Inaddition, an optically pure compound can be also prepared from anappropriate material.

The compound of the present invention can be a useful agent for treatingtumor, particularly malignant tumor, in more detail, the compound can bea novel agent for treating and/or preventing childhood brain tumorselected from the group consisting of astrocytoma, malignantmedulloblastoma, germ cell tumor, craniopharyngioma, and ependymoma;adult brain tumor selected from the group consisting of glioma,meningioma, pituitary adenoma, and nerve sheath tumor; head and neckcancer selected from the group consisting of maxillary sinus cancer,pharyngeal cancer (e.g. nasopharyngeal cancer, oropharyngeal cancer,hypopharyngeal cancer), laryngeal cancer, oral cancer (e.g. lip cancer,tongue cancer), and salivary gland cancer (e.g. parotid gland cancer);thoracic cancer and tumor selected from the group consisting of smallcell lung cancer, non-small-cell lung cancer, thymoma, and mesothelioma;gastrointestinal cancer and tumor selected from the group consisting ofesophageal cancer, liver cancer, primary liver cancer, gallbladdercancer, bile duct cancer, gastric cancer, colorectal cancer (e.g. rectalcancer, anal cancer), pancreatic cancer, and pancreatic endocrine tumor;urologic cancer and tumor selected from the group consisting of penilecancer, renal pelvic/ureter cancer, renal cell cancer, testicular tumor(also referred to as testicular neoplasm), prostate cancer, bladdercancer, Wilms' tumor, and urothelial carcinoma; gynecologic cancer andtumor selected from the group consisting of vulvar cancer, cervicalcancer, uterine body cancer, endometrial cancer, uterine sarcoma,choriocarcinoma, vaginal cancer, breast cancer, ovarian cancer, andovarian germ cell tumor; adult and childhood soft tissue sarcoma; bonetumor selected from the group consisting of osteosarcoma and Ewing'stumor; endocrine tissue cancer and tumor selected from the groupconsisting of adrenocortical carcinoma and thyroid cancer; malignantlymphoma and leukemia selected from the group consisting of malignantlymphoma, non-Hodgkin's lymphoma, Hodgkin's disease, multiple myeloma,plasma cell neoplasm, acute myeloid leukemia, acute lymphoblasticleukemia, adult T-cell leukemia-lymphoma, chronic myeloid leukemia, andchronic lymphocytic leukemia; or skin cancer and tumor selected from thegroup consisting of chronic myeloproliferative disorder, malignantmelanoma, squamous cell carcinoma, basal cell carcinoma, and mycosisfungoides. The administration route of the present compound may beselected from oral administration, parenteral administration or rectaladministration, and the daily dosage may vary depending on the compoundstructure, the administration route, the condition/age of patients, etc.For example, in case of oral administration, the present compound may beadministered to a human being or a mammal in a dosage of generally about0.01 μg-10 mg, preferably about 1 μg-5 mg, per kg of its body weight, inone to several divided doses. For example, in case of parenteraladministration such as intravenous injection, the present compound maybe administered to a human being or a mammal in a dosage of generallyabout 0.01 μg-10 mg, preferably about 1 μg-5 mg, per kg of its bodyweight.

The dosage form in the present invention includes tablet, capsule,granule, powder, syrup, suspension, injection, suppository, eyedrop,ointment, liniment, patch, and inhalant. These dosage forms can beprepared in a conventional manner. If the dosage form is a liquid one,it may be a formulation to prepare a solution or suspension in use bymixing it with water, appropriate water-solution, or other appropriatesolvent. The tablet and the granule may be coated in a well-knownmanner. Furthermore, these dosage forms may comprise anothertherapeutically-useful ingredient.

In case that the present compound is formulated into a single dosageform, the dosage form may include the present compound in 0.1-70% (w/w)per the whole composition, but the present invention is not limitedthereto. Preferably, it is 5-40% (w/w) per the whole composition.

EXAMPLES

The present invention is explained in more detail in the following byreferring to Reference examples, Examples and Test, however, the presentinvention should not be limited thereto.

Reference Example 1 Production of(4-bromo-2-chloro-6-methylphenoxy)-tert-butyldimethylsilane

To a mixture of 4-bromo-2-chloro-6-methylphenol (13.3 g) in DMF (120 mL)were added imidazole (6.1 g) and tert-butylchlorodimethylsilane (10.9g), and the mixture was stirred at room temperature overnight. Thesolvent was removed, and water was added to the residue. The mixture wasextracted with ethyl acetate. The organic layer was washed with waterand brine, dried over anhydrous sodium sulfate, and filtrated, and thesolvent was removed. The obtained crude product was purified by silicagel column chromatography (heptane:ethyl acetate=100:0 to 99:1) toafford the title compound as a colorless oil (20.0 g).

¹H-NMR (CDCl₃) δ: 0.24 (6H, s), 1.03 (9H, s), 2.22 (3H, s), 7.14-7.17(1H, m), 7.30-7.33 (1H, m).

Reference Example 2 Production of methyl2-(4-bromo-2-chloro-6-fluorophenoxy)acetate

To a mixture of 4-bromo-2-chloro-6-fluorophenol (2.0 g) and potassiumcarbonate (1.47 g) in DMF (15 mL) was added methyl bromoacetate (0.924mL), and the mixture was stirred at room temperature for 2 hours. To thereaction mixture was added water, and the mixture was extracted withethyl acetate. The organic layer was washed with water and brine, driedover anhydrous sodium sulfate, and filtrated, and the solvent wasremoved. The obtained crude product was purified by silica gel columnchromatography (heptane:ethyl acetate=80:20 to 60:40) to afford thetitle compound as a colorless oil (2.53 g).

¹H-NMR (CDCl₃) δ: 3.81 (3H, s), 4.73 (2H, s), 7.20 (1H, dd, J=10.4, 2.3Hz), 7.33-7.37 (1H, m).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 2.

Reference Example 3 Methyl 2-(4-bromo-2-fluoro-6-methylphenoxy)acetate

¹H-NMR (CDCl₃) δ: 2.33 (3H, s), 3.79 (3H, s), 4.69 (2H, d, J=1.0 Hz),7.06-7.11 (2H, m).

Reference Example 4 Methyl 2-(4-bromo-3-fluoro-2-methylphenoxy)acetate

¹H-NMR (CDCl₃) δ: 2.24 (3H, d, J=2.3 Hz), 3.80 (3H, s), 4.65 (2H, s),6.42 (1H, dd, J=8.9, 1.2 Hz), 7.28 (1H, t, J=8.9 Hz).

Reference Example 5 Production of methyl2-(4-bromo-2-chloro-3-fluorophenoxy)acetate

To a mixture of 2-chloro-3-fluorophenol (2.6 g) in acetic acid (30 mL)was added pyridinium bromide perbromide (6.0 g), and the mixture wasstirred at room temperature for 4.5 hours. To the reaction mixture wasadded aqueous sodium thiosulfate, and the mixture was extracted withtoluene. The organic layer was washed with water and brine, dried overanhydrous sodium sulfate, and filtrated, and the solvent was removed toafford a yellow oil (3.4 g). This oil was dissolved in DMF (30 mL), andpotassium carbonate (4.9 g) and methyl bromoacetate (2.0 mL) were addedto the mixture. The mixture was stirred at room temperature for 30minutes. To the reaction mixture was added water, and the mixture wasextracted with ethyl acetate. The organic layer was washed with waterand brine, dried over anhydrous sodium sulfate, and filtrated, and thesolvent was removed. The obtained crude product was purified by silicagel column chromatography (heptane:ethyl acetate=100:0 to 84:16) toafford the title compound as a colorless oil (2.3 g).

¹H-NMR (CDCl₃) δ: 3.81 (3H, s), 4.73 (2H, s), 6.56 (1H, dd, J=9.0, 1.8Hz), 7.37 (1H, dd, J=9.0, 7.4 Hz).

Reference Example 6 Production of1-[(4-bromo-2-chloro-6-fluorophenoxy)methyl]cyclopropan-1-ol

Under an argon atmosphere, to a mixture of methyl2-(4-bromo-2-chloro-6-fluorophenoxy)acetate (Reference example 2, 2.53g) in THF (30 mL) was added tetraisopropyl orthotitanate (2.49 mL) at 0°C. Ethylmagnesium bromide (3.0 M diethyl ether solution, 7.65 mL) wasslowly added thereto at 0° C., and the reaction mixture was stirred atroom temperature for one hour. To the reaction mixture was added 1 Mhydrochloric acid at 0° C., and the mixture was extracted with ethylacetate. The organic layer was washed with brine, dried over anhydroussodium sulfate, and filtrated, and the solvent was removed. The obtainedcrude product was purified by silica gel column chromatography(heptane:ethyl acetate=100:0 to 80:20) and then by amino silica gelcolumn chromatography (methylene chloride:methanol=100:0 to 90:10) toafford the title compound as a colorless oil (1.15 g).

¹H-NMR (CDCl₃) δ: 0.60-0.66 (2H, m), 0.89-0.95 (2H, m), 2.95 (1H, s),4.14 (2H, s), 7.21 (1H, dd, J=9.8, 2.2 Hz), 7.33-7.37 (1H, m).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 6.

Reference Example 7 1-[(2,3-Difluorophenoxy)methyl]cyclopropan-1-ol

¹H-NMR (CDCl₃) δ: 0.68-0.74 (2H, m), 0.95-1.00 (2H, m), 2.78 (1H, s),4.08 (2H, s), 6.71-6.84 (2H, m), 6.93-7.02 (1H, m).

Reference Example 81-[(4-Bromo-2,6-dimethylphenoxy)methyl]cyclopropan-1-ol

¹H-NMR (CDCl₃) δ: 0.66-0.71 (2H, m), 0.93-0.98 (2H, m), 2.26-2.28 (6H,m), 2.77 (1H, s), 3.78 (2H, s), 7.13-7.16 (2H, m).

Reference Example 91-[(4-Bromo-2-chloro-6-methylphenoxy)methyl]cyclopropan-1-ol

¹H-NMR (CDCl₃) δ: 0.66-0.73 (2H, m), 0.92-0.98 (2H, m), 2.32 (3H, s),2.90 (1H, s), 3.95 (2H, s), 7.23 (1H, dd, J=2.4, 0.6 Hz), 7.37 (1H, d,J=2.4 Hz).

Reference Example 101-[(4-Bromo-2-fluoro-6-methylphenoxy)methyl]cyclopropan-1-ol

¹H-NMR (CDCl₃) δ: 0.62-0.68 (2H, m), 0.90-0.95 (2H, m), 2.30 (3H, s),2.76 (1H, d, J=1.0 Hz), 4.02 (2H, s), 7.07-7.13 (2H, m).

Reference Example 111-[(4-Bromo-3-fluoro-2-methylphenoxy)methyl]cyclopropan-1-ol

¹H-NMR (CDCl₃) δ: 0.69-0.75 (2H, m), 0.95-1.00 (2H, m), 2.22 (3H, d,J=2.3 Hz), 2.59 (1H, s), 4.00 (2H, s), 6.53 (1H, dd, J=8.9, 1.3 Hz),7.25-7.32 (1H, m).

Reference Example 121-[(4-Bromo-2-chloro-3-fluorophenoxy)methyl]cyclopropan-1-ol

¹H-NMR (CDCl₃) δ: 0.70-0.76 (2H, m), 0.96-1.03 (2H, m), 2.81 (1H, s),4.07 (2H, s), 6.65 (1H, dd, J=9.0, 1.8 Hz), 7.38 (1H, dd, J=9.0, 7.5Hz).

Reference Example 13 Production of{1-[(4-bromo-2-chloro-6-fluorophenoxy)methyl]cyclopropyloxy}triethylsilane

To a mixture of1-[(4-bromo-2-chloro-6-fluorophenoxy)methyl]cyclopropan-1-ol (Referenceexample 6, 1.15 g) in methylene chloride (15 mL) were added 2,6-lutidine(0.544 mL) and triethylsilyl trifluoromethanesulfonate (0.968 mL) at 0°C. The reaction mixture was stirred at room temperature overnight. Tothe reaction mixture was added water, and then the mixture was extractedwith methylene chloride. The organic layer was washed with brine, driedover anhydrous sodium sulfate, and filtrated, and the solvent wasremoved. The obtained crude product was purified by silica gel columnchromatography (heptane:ethyl acetate=100:0 to 85:15) to afford thetitle compound as a colorless oil (1.08 g).

¹H-NMR (CDCl₃) δ: 0.64 (6H, q, J=7.8 Hz), 0.77-0.84 (2H, m), 0.84-0.91(2H, m), 0.95 (9H, t, J=7.8 Hz), 4.05 (2H, s), 7.17 (1H, dd, J=10.0, 2.4Hz), 7.30-7.33 (1H, m).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 13.

Reference Example 14{1-[(2,3-Difluorophenoxy)methyl]cyclopropyloxy}triethylsilane

¹H-NMR (CDCl₃) δ: 0.62-0.70 (6H, m), 0.73-0.78 (2H, m), 0.86-0.99 (11H,m), 4.02 (2H, s), 6.67-6.81 (2H, m), 6.91-7.00 (1H, m).

Reference Example 15{1-[(4-Bromo-2,6-dimethylphenoxy)methyl]cyclopropyloxy}triethylsilane

¹H-NMR (CDCl₃) δ: 0.64 (6H, q, J=7.9 Hz), 0.74-0.79 (2H, m), 0.87-0.92(2H, m), 0.96 (9H, t, J=7.9 Hz), 2.25 (6H, s), 3.73 (2H, s), 7.12 (2H,s).

Reference Example 16{1-[(4-Bromo-2-chloro-6-methylphenoxy)methyl]cyclopropyloxy}triethylsilane

¹H-NMR (CDCl₃) δ: 0.60-0.68 (6H, m), 0.77-0.81 (2H, m), 0.86-0.91 (2H,m), 0.92-0.98 (9H, m), 2.32 (3H, s), 3.90 (2H, s), 7.21 (1H, dd, J=2.4,0.7 Hz), 7.33 (1H, dd, J=2.4, 0.5 Hz).

Reference Example 17{1-[(4-Bromo-2-fluoro-6-methylphenoxy)methyl]cyclopropyloxy}triethylsilane

¹H-NMR (CDCl₃) δ: 0.62 (6H, q, J=8.0 Hz), 0.68-0.74 (2H, m), 0.83-0.89(2H, m), 0.94 (9H, t, J=8.0 Hz), 2.30 (3H, s), 3.98 (2H, s), 7.04-7.09(2H, m).

Reference Example 18{1-[(4-Bromo-3-fluoro-2-methylphenoxy)methyl]cyclopropyloxy}triethylsilane

¹H-NMR (CDCl₃) δ: 0.59-0.68 (6H, m), 0.73-0.78 (2H, m), 0.85-0.90 (2H,m), 0.93 (9H, t, J=7.9 Hz), 2.20 (3H, d, J=2.3 Hz), 3.96 (2H, s), 6.50(1H, dd, J=8.9, 1.3 Hz), 7.24-7.30 (1H, m).

Reference Example 19{1-[(4-Bromo-2-chloro-3-fluorophenoxy)methyl]cyclopropyloxy}triethylsilane

¹H-NMR (CDCl₃) δ: 0.61-0.71 (6H, m), 0.75-0.98 (13H, m), 4.03 (2H, s),6.63 (1H, dd, J=9.0, 1.7 Hz), 7.36 (1H, dd, J=9.0, 7.6 Hz).

Reference Example 20 Production of3-chloro-5-fluoro-4-{[1-(triethylsilyloxy)cyclopropyl]methoxy}benzaldehyde

Under an argon atmosphere, to a mixture of{1-[(4-bromo-2-chloro-6-fluorophenoxy)methyl]cyclopropyloxy}triethylsilane(Reference example 13, 1.08 g) in THF (10 mL) at −78° C. was addedn-butyl lithium (1.6 M n-hexane solution, 1.73 mL), and under the samecondition, the reaction mixture was stirred for 30 minutes. At −78° C.,DMF (0.224 mL) was added to the reaction mixture, and the reactionmixture was stirred at −78° C. for 30 minutes and then at roomtemperature for 30 minutes. To the reaction mixture was added aqueousammonium chloride, and the mixture was extracted with ethyl acetate. Theorganic layer was washed with brine, dried over anhydrous sodiumsulfate, and filtrated, and the solvent was removed. The obtained crudeproduct was purified by silica gel column chromatography (heptane:ethylacetate=100:0 to 90:10) to afford the title compound as a colorless oil(873 mg).

¹H-NMR (CDCl₃) δ: 0.63 (6H, q, J=7.9 Hz), 0.78-0.85 (2H, m), 0.86-0.99(2H, m), 0.94 (9H, t, J=7.9 Hz), 4.23 (2H, s), 7.53 (1H, dd, J=10.7, 2.0Hz), 7.69-7.72 (1H, m), 9.84 (1H, d, J=2.0 Hz).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 20.

Reference Example 213,5-Dimethyl-4-{[1-(triethylsilyloxy)cyclopropyl]methoxy}benzaldehyde

¹H-NMR (CDCl₃) δ: 0.64 (6H, q, J=7.9 Hz), 0.76-0.80 (2H, m), 0.86-0.92(2H, m), 0.96 (9H, t, J=7.9 Hz), 2.36 (6H, s), 3.83 (2H, s), 7.55 (2H,s), 9.87 (1H, s).

Reference Example 223-Chloro-5-methyl-4-{[1-(triethylsilyloxy)cyclopropyl]methoxy}benzaldehyde

¹H-NMR (CDCl₃) δ: 0.59-0.70 (6H, m), 0.76-1.01 (13H, m), 2.43 (3H, s),4.02 (2H, s), 7.61 (1H, d, J=1.6 Hz), 7.73 (1H, d, J=1.6 Hz), 9.86 (1H,s).

Reference Example 232-Fluoro-3-methyl-4-{[1-(triethylsilyloxy)cyclopropyl]methoxy}benzaldehyde

¹H-NMR (CDCl₃) δ: 0.63 (6H, q, J=7.9 Hz), 0.75-0.80 (2H, m), 0.87-0.98(11H, m), 2.20 (3H, d, J=2.1 Hz), 4.08 (2H, s), 6.70 (1H, d, J=8.8 Hz),7.70 (1H, t, J=8.8 Hz), 10.22 (1H, s).

Reference Example 243-Fluoro-5-methyl-4-{[1-(triethylsilyloxy)cyclopropyl]methoxy}benzaldehyde

¹H-NMR (CDCl₃) δ: 0.61 (6H, q, J=7.9 Hz), 0.71-0.76 (2H, m), 0.85-0.90(2H, m), 0.93 (9H, t, J=7.9 Hz), 2.39 (3H, s), 4.18 (2H, s), 7.44 (1H,dd, J=11.4, 1.9 Hz), 7.47-7.50 (1H, m), 9.84 (1H, d, J=2.0 Hz).

Reference Example 253-Chloro-2-fluoro-4-{[1-(triethylsilyloxy)cyclopropyl]methoxy}benzaldehyde

¹H-NMR (CDCl₃) δ: 0.66 (6H, q, J=7.9 Hz), 0.78-0.84 (2H, m), 0.89-0.98(11H, m), 4.14 (2H, s), 6.82 (1H, d, J=9.0 Hz), 7.77 (1H, dd, J=9.0, 7.7Hz), 10.22 (1H, s).

Reference Example 26 Production of2,3-difluoro-4-{[1-(triethylsilyloxy)cyclopropyl]methoxy}benzaldehyde

Under an argon atmosphere, to a mixture of{1-[(2,3-difluorophenoxy)methyl]cyclopropyloxy}triethylsilane (Referenceexample 14, 1.4 g) and 2,2,6,6-tetramethylpiperidine (0.8 mL) in THF (10mL) at −78° C. was added n-butyl lithium (1.6 M n-hexane solution, 2.9mL). The mixture was stirred at −78° C. for 30 minutes, and then DMF(0.4 mL) was added thereto. The reaction mixture was stirred at −78° C.for 30 minutes, and then at room temperature for 30 minutes. To thereaction mixture was added aqueous ammonium chloride at 0° C., and themixture was extracted with ethyl acetate. The organic layer was washedwith brine, dried over anhydrous sodium sulfate, and filtrated, and thesolvent was removed. The obtained crude product was purified by silicagel column chromatography (heptane:ethyl acetate=94:6 to 76:24) toafford the title compound as a colorless oil (1.3 g).

¹H-NMR (CDCl₃) δ: 0.60-0.69 (6H, m), 0.74-0.79 (2H, m), 0.86-0.96 (11H,m), 4.11 (2H, s), 6.79-6.86 (1H, m), 7.57-7.64 (1H, m), 10.20 (1H, s).

Reference Example 27 Production of3-bromo-2-fluoro-4-methoxybenzaldehyde

A mixture of 2-bromo-3-fluoroanisole (25 g), hexamethylenetetramine(34.2 g), and trifluoroacetic acid (150 mL) was stirred at 90° C. for 27hours. The reaction mixture was allowed to cool to room temperature, andthen 1 M hydrochloric acid was added to the reaction mixture. Thereaction mixture was extracted with ethyl acetate, and then the organiclayer was concentrated to about half of its volume. To the concentratedorganic layer was added aqueous sodium hydroxide, and then the organiclayer was separated from the mixture and washed with brine. The organiclayer was dried over anhydrous sodium sulfate, and filtrated, and thesolvent was removed. The obtained crude product was purified by silicagel column chromatography (heptane:ethyl acetate=94:6 to 73:27) toafford the title compound as a white solid (22.3 g).

¹H-NMR (CDCl₃) δ: 4.01 (3H, s), 6.82 (1H, d, J=8.8 Hz), 7.85 (1H, dd,J=8.8, 7.7 Hz), 10.22 (1H, d, J=0.7 Hz).

Reference Example 28 Production of2-fluoro-4-methoxy-3-methylbenzaldehyde

To a mixture of 3-bromo-2-fluoro-4-methoxybenzaldehyde (Referenceexample 27, 6.0 g) in 1,2-dimethoxyethane (90 mL) were added methylboronate (4.6 g), tripotassium phosphate (16.4 g) and[1,1′-bis(diphenylphosphino)ferrocene]palladium dichloride complex withmethylene chloride (1.1 g). The reaction mixture was refluxed for 24hours under an argon atmosphere. The reaction mixture was allowed tocool to room temperature, and then ethyl acetate was added thereto. Themixture was filtered through a Celite pad, and then aqueous ammoniumchloride was added to the filtrate. The organic layer was separated fromthe mixture, washed with brine, dried over anhydrous sodium sulfate, andfiltrated, and the solvent was removed. The obtained crude product waspurified by silica gel column chromatography (heptane:ethylacetate=100:0 to 73:27) to afford the title compound as a white solid(3.8 g).

¹H-NMR (CDCl₃) δ: 2.15 (3H, d, J=2.2 Hz), 3.92 (3H, s), 6.74 (1H, d,J=8.7 Hz), 7.73 (1H, t, J=8.7 Hz), 10.22 (1H, s).

Reference Example 29 Production of3-chloro-2-fluoro-4-hydroxy-5-methylbenzaldehyde

To a mixture of 2-fluoro-4-hydroxy-5-methylbenzaldehyde (2.7 g) inacetic acid (5 mL) was added sulfuryl chloride (2.8 mL), and the mixturewas stirred at room temperature for 3 hours. Sulfuryl chloride (0.7 mL)was added thereto, and the reaction mixture was stirred at roomtemperature further for one hour. To the reaction mixture was added icein water at 0° C., and the obtained precipitates were collected on afilter. The collected precipitates were dissolved in ethyl acetate, themixture was dried over anhydrous sodium sulfate and filtrated, and thesolvent was removed. The obtained crude product was purified by silicagel column chromatography (heptane:ethyl acetate=88:12 to 67:33) toafford the title compound as a white solid (1.3 g).

¹H-NMR (DMSO-d6) δ: 2.23 (3H, s), 7.56 (1H, dd, J=7.9, 0.7 Hz), 10.02(1H, s), 10.98 (1H, brs).

Reference Example 30 Production of5-chloro-2-fluoro-4-methoxy-3-methylbenzaldehyde

Under an argon atmosphere, to a mixture of1-chloro-4-fluoro-2-methoxy-3-methylbenzene (2.6 g) in methylenechloride (30 mL) were added titanium tetrachloride (8.1 mL) anddichloromethyl methyl ether (2.7 mL) at 0° C. The reaction mixture wasstirred at 0° C. for 1.5 hours, and then poured into ice in water. Themixture was stirred at room temperature for one hour, and then extractedwith ethyl acetate. The organic layer was washed with brine, dried overanhydrous sodium sulfate, and filtrated, and the solvent was removed.The obtained crude product was purified by silica gel columnchromatography (heptane:ethyl acetate=100:0 to 90:10) to afford thetitle compound as a white solid (2.6 g).

¹H-NMR (CDCl₃) δ: 2.28 (3H, d, J=2.4 Hz), 3.91 (3H, s), 7.75 (1H, d,J=7.3 Hz), 10.24 (1H, s).

Reference Example 31 Production of 3-chloro-2,4-dimethoxybenzaldehyde

A suspension of 3-chloro-2,4-dihydroxybenzaldehyde (3.35 g), methyliodide (12.1 mL), and potassium carbonate (26.8 g) in acetone (70 mL)was stirred at 40° C. overnight. The reaction mixture was filteredthrough a Celite pad, and the filtrate was concentrated. The obtainedcrude product was purified by silica gel column chromatography(heptane:ethyl acetate=85:15) to afford the title compound as a paleyellow solid (2.57 g).

¹H-NMR (CDCl₃) δ: 3.99 (3H, s), 4.01 (3H, s), 6.84 (1H, d, J=9.0 Hz),7.79-7.82 (1H, m), 10.24 (1H, s).

Reference Example 32 Production of3-bromo-5-chloro-4-(methoxymethyloxy)benzaldehyde

To a mixture of 3-Bromo-5-chloro-4-hydroxybenzaldehyde (1.00 g) indichloroethane (20 mL) were added N,N-diisopropylethylamine (2.23 mL)and chloromethyl methyl ether (0.645 mL), and the mixture was refluxedovernight. The reaction mixture was concentrated, water was added to theresidue, and then the mixture was extracted with ethyl acetate. Theorganic layer was washed with water and brine, dried over anhydroussodium sulfate, and filtrated, and the solvent was removed. The obtainedcrude product was purified by silica gel column chromatography(heptane:ethyl acetate=83:17 to 67:33) to afford the title compound as awhite solid (920 mg).

¹H-NMR (CDCl₃) δ 3.72 (3H, s), 5.29 (2H, s), 7.87 (1H, d, J=2.0 Hz),8.00 (1H, d, J=2.0 Hz), 9.87 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 32.

Reference Example 33 3-Bromo-5-fluoro-4-(methoxymethyloxy)benzaldehyde

¹H-NMR (CDCl₃) δ: 3.63 (3H, s), 5.34 (2H, d, J=1.0 Hz), 7.59 (1H, dd,J=10.6, 1.9 Hz), 7.89 (1H, dd, J=1.9, 1.3 Hz), 9.86 (1H, d, J=2.1 Hz).

Reference Example 34 3,5-Dichloro-4-(methoxymethyloxy)benzaldehyde

¹H-NMR (CDCl₃) δ: 3.70 (3H, s), 5.29 (2H, s), 7.84 (2H, s), 9.87 (1H,s).

Reference Example 354-Benzyloxy-3-chloro-2-(methoxymethyloxy)benzaldehyde

¹H-NMR (CDCl₃) δ: 3.63 (3H, s), 5.24 (2H, s), 5.25 (2H, s), 6.90 (1H, d,J=8.8 Hz), 7.32-7.48 (5H, m), 7.77 (1H, d, J=8.8 Hz), 10.23 (1H, s).

Reference Example 364-Benzyloxy-2-(methoxymethyloxy)-3-methylbenzaldehyde

¹H-NMR (CDCl₃) δ: 2.24 (3H, s), 3.61 (3H, s), 5.08 (2H, s), 5.16 (2H,s), 6.83 (1H, d, J=8.5 Hz), 7.32-7.46 (5H, m), 7.72 (1H, d, J=8.8 Hz),10.19 (1H, s).

Reference Example 373-Chloro-2-fluoro-4-(methoxymethyloxy)-5-methylbenzaldehyde

¹H-NMR (CDCl₃) δ: 2.34-2.36 (3H, m), 3.65 (3H, s), 5.20 (2H, s), 7.62(1H, dd, J=7.6, 0.7 Hz), 10.26 (1H, s).

Reference Example 38 Production of1-[4-(tert-butyldimethylsilyloxy)-3-chloro-5-methylphenyl]propan-1-one

Under an argon atmosphere, to a mixture of(4-bromo-2-chloro-6-methylphenoxy)-tert-butyldimethylsilane (Referenceexample 1, 10.0 g) in THF (100 mL) at −78° C. was added dropwise n-butyllithium (2.65 M n-hexane solution, 11.8 mL). The reaction mixture wasstirred at the same temperature for 30 minutes, and thenN,N-dimethylpropanamide (3.9 mL) was added thereto. The reaction mixturewas stirred at the same temperature for 30 minutes and then at roomtemperature for 2 hours. To the reaction mixture at −78° C. was addedaqueous ammonium chloride to quench the reaction. The mixture wasextracted with ethyl acetate, and the organic layer was washed withbrine, dried over anhydrous sodium sulfate, and filtrated, and thesolvent was removed. The obtained crude product was purified by silicagel column chromatography (heptane:ethyl acetate=100:0 to 91:9) toafford the title compound as a pale yellow oil (6.3 g).

¹H-NMR (CDCl₃) δ: 0.28 (6H, s), 1.04 (9H, s), 1.20 (3H, t, J=7.3 Hz),2.29 (3H, s), 2.92 (2H, q, J=7.3 Hz), 7.67 (1H, d, J=2.1 Hz), 7.81 (1H,d, J=2.1 Hz).

Reference Example 39 Production of methyl4-[4-(tert-butyldimethylsilyloxy)-3-chloro-5-methylphenyl]-3-methyl-4-oxobutanoate

Under an argon atmosphere, to a mixture of1-[4-(tert-butyldimethylsilyloxy)-3-chloro-5-methylphenyl]propan-1-one(Reference example 38, 6.3 g) in THF (100 mL) at −78° C. was addeddropwise lithium diisopropylamide (2.0 M, a mixed solution ofTHF/heptane/ethylbenzene, 15.0 mL). The mixture was stirred at the sametemperature for one hour, and then methyl bromoacetate (2.9 mL) wasadded thereto. The reaction mixture was stirred at −78° C. for 15minutes, and then at room temperature overnight. The reaction mixturewas cooled on ice-methanol bath, and then aqueous ammonium chloride wasadded thereto. The mixture was extracted with ethyl acetate, and theorganic layer was washed with brine, dried over anhydrous sodiumsulfate, and filtrated, and the solvent was removed. The obtained crudeproduct was purified by silica gel column chromatography (heptane:ethylacetate=100:0 to 82:18) to afford the title compound as a pale yellowoil (2.7 g).

¹H-NMR (CDCl₃) δ: 0.28 (6H, s), 1.04 (9H, s), 1.21 (3H, d, J=7.1 Hz),2.30 (3H, s), 2.44 (1H, dd, J=16.8, 5.7 Hz), 2.94 (1H, dd, J=16.8, 8.5Hz), 3.65 (3H, s), 3.80-3.90 (1H, m), 7.70 (1H, d, J=2.3 Hz), 7.85 (1H,d, J=2.3 Hz).

The following compound was prepared from the appropriate startingmaterial in a similar manner to Reference example 39.

Reference Example 40 Methyl4-(3,5-difluoro-4-methoxyphenyl)-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.21 (3H, d, J=7.2 Hz), 2.46 (1H, dd, J=17.0, 5.3 Hz),2.96 (1H, dd, J=17.0, 9.0 Hz), 3.65 (3H, s), 3.73-3.85 (1H, m), 4.11(3H, t, J=1.6 Hz), 7.52-7.60 (2H, m).

Reference Example 41 Production of methyl4-[3-bromo-5-chloro-4-(methoxymethyloxy)phenyl]-3-methyl-4-oxobutanoate

Under an argon atmosphere, to3-bromo-5-chloro-4-(methoxymethyloxy)benzaldehyde (Reference example 32,885 mg) were added lithium chloride (7 mg) and trimethylsilyl cyanide(0.509 mL), and the mixture was stirred at 50° C. for 2 hours. THF (30mL) was added to the mixture to dissolve the mixture, and then thereaction mixture was cooled to −78° C. To the mixture was slowly addedlithium diisopropylamide (2.0 M, a mixed solution ofTHF/heptane/ethylbenzene, 1.90 mL), and the mixture was stirred at −78°C. for 30 minutes. Methyl crotonate (0.369 mL) was added to the reactionmixture, and then the mixture was stirred at the same temperature for 2hours. To the reaction mixture was added water, and the mixture wasextracted with ethyl acetate. The organic layer was washed with waterand brine, dried over anhydrous sodium sulfate, and filtrated, and thesolvent was removed. The residue was purified by silica gel columnchromatography (heptane:ethyl acetate=83:17 to 67:33) to afford thetitle compound as a pale yellow oil (1.15 g).

¹H-NMR (CDCl₃) δ: 1.21 (3H, d, J=7.1 Hz), 2.46 (1H, dd, J=17.1, 5.1 Hz),2.96 (1H, dd, J=17.1, 9.0 Hz), 3.65 (3H, s), 3.71 (3H, s), 3.74-3.87(1H, m), 5.26 (2H, s), 7.97 (1H, d, J=2.0 Hz), 8.10 (1H, d, J=2.0 Hz).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 41.

Reference Example 42 Methyl4-(3-chloro-5-fluoro-4-methoxyphenyl)-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.21 (3H, d, J=7.2 Hz), 2.47 (1H, dd, J=17.0, 5.2 Hz),2.97 (1H, dd, J=17.0, 8.9 Hz), 3.65 (3H, s), 3.75-3.86 (1H, m), 4.08(3H, d, J=2.7 Hz), 7.66 (1H, dd, J=11.8, 2.1 Hz), 7.80-7.83 (1H, m).

Reference Example 43 Methyl4-(3-chloro-2-fluoro-4-methoxyphenyl)-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.22 (3H, dd, J=7.1, 1.0 Hz), 2.44 (1H, dd, J=16.8,5.3 Hz), 2.96 (1H, ddd, J=16.8, 8.8, 1.8 Hz), 3.65 (3H, s), 3.73-3.83(1H, m), 3.98 (3H, s), 6.83 (1H, dd, J=9.0, 1.3 Hz), 7.82 (1H, dd,J=9.0, 8.1 Hz).

Reference Example 44 Methyl4-(2,4-dimethoxy-3-methylphenyl)-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.14 (3H, d, J=7.3 Hz), 2.17 (3H, s), 2.38 (1H, dd,J=16.6, 5.7 Hz), 2.89 (1H, dd, J=16.6, 8.3 Hz), 3.67 (3H, s), 3.77 (3H,s), 3.87 (3H, s), 3.88-3.98 (1H, m), 6.68 (1H, d, J=8.5 Hz), 7.53 (1H,d, J=8.5 Hz).

Reference Example 45 Methyl4-(3-chloro-2,4-dimethoxyphenyl)-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.15 (3H, d, J=7.1 Hz), 2.40 (1H, dd, J=16.9, 5.4 Hz),2.91 (1H, dd, J=16.9, 8.8 Hz), 3.67 (3H, s), 3.84-3.95 (1H, m), 3.94(3H, s), 3.95 (3H, s), 6.79 (1H, d, J=8.8 Hz), 7.61 (1H, d, J=8.8 Hz).

Reference Example 46 Methyl4-[3-bromo-5-fluoro-4-(methoxymethyloxy)phenyl]-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.22 (3H, d, J=7.2 Hz), 2.47 (1H, dd, J=17.0, 5.3 Hz),2.97 (1H, dd, J=17.0, 9.0 Hz), 3.63 (3H, s), 3.65 (3H, s), 3.75-3.86(1H, m), 5.31 (2H, d, J=0.6 Hz), 7.70 (1H, dd, J=11.5, 2.1 Hz), 8.00(1H, t, J=2.1 Hz).

Reference Example 47 Methyl4-(3-bromo-2-fluoro-4-methoxyphenyl)-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.22 (3H, dd, J=7.1, 0.9 Hz), 2.44 (1H, dd, J=16.7,5.4 Hz), 2.95 (1H, ddd, J=16.7, 8.7, 1.8 Hz), 3.65 (3H, s), 3.73-3.83(1H, m), 3.98 (3H, s), 6.79 (1H, dd, J=9.0, 1.2 Hz), 7.88 (1H, dd,J=9.0, 8.2 Hz).

Reference Example 48 Methyl4-[4-(methoxymethyloxy)-3,5-dimethylphenyl]-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.21 (3H, d, J=7.2 Hz), 2.34 (6H, s), 2.44 (1H, dd,J=16.7, 5.9 Hz), 2.95 (1H, dd, J=16.7, 8.3 Hz), 3.62 (3H, s), 3.65 (3H,s), 3.85-3.96 (1H, m), 5.01 (2H, s), 7.68 (2H, s).

Reference Example 49 Methyl4-(3-fluoro-4-methoxy-5-methylphenyl)-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.21 (3H, d, J=7.2 Hz), 2.30 (3H, s), 2.45 (1H, dd,J=16.9, 5.6 Hz), 2.95 (1H, dd, J=16.9, 8.5 Hz), 3.65 (3H, s), 3.79-3.90(1H, m), 4.01 (3H, d, J=2.9 Hz), 7.54-7.62 (2H, m).

Reference Example 50 Methyl4-(2-fluoro-4-methoxy-3-methylphenyl)-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.21 (3H, dd, J=7.1, 0.9 Hz), 2.15 (3H, d, J=2.4 Hz),2.41 (1H, dd, J=16.6, 5.8 Hz), 2.94 (1H, ddd, J=16.6, 8.3, 1.7 Hz), 3.65(3H, s), 3.76-3.86 (1H, m), 3.90 (3H, s), 6.71 (1H, d, J=8.8 Hz), 7.74(1H, t, J=8.8 Hz).

Reference Example 51 Methyl4-(5-chloro-2-fluoro-4-methoxy-3-methylphenyl)-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.21 (3H, dd, J=7.1, 0.9 Hz), 2.27 (3H, dd, J=2.7, 0.5Hz), 2.43 (1H, dd, J=16.9, 5.4 Hz), 2.95 (1H, ddd, J=16.9, 8.7, 1.7 Hz),3.66 (3H, s), 3.71-3.80 (1H, m), 3.88 (3H, s), 7.73 (1H, dd, J=7.6, 0.6Hz).

Reference Example 52 Methyl4-[4-benzyloxy-3-chloro-2-(methoxymethyloxy)phenyl]-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.14 (3H, d, J=7.1 Hz), 2.39 (1H, dd, J=16.6, 5.9 Hz),2.86 (1H, dd, J=16.6, 8.1 Hz), 3.58 (3H, s), 3.66 (3H, s), 3.84-3.96(1H, m), 5.12 (1H, d, J=5.6 Hz), 5.17 (1H, d, J=5.6 Hz), 5.21 (2H, s),6.83 (1H, d, J=8.8 Hz), 7.31-7.49 (5H, m), 7.53 (1H, d, J=8.8 Hz).

Reference Example 53 Methyl4-[4-benzyloxy-2-(methoxymethyloxy)-3-methylphenyl]-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.14 (3H, d, J=7.1 Hz), 2.27 (3H, s), 2.37 (1H, dd,J=16.6, 6.1 Hz), 2.87 (1H, dd, J=16.6, 7.8 Hz), 3.54 (3H, s), 3.66 (3H,s), 3.83-3.95 (1H, m), 4.96 (1H, d, J=6.6 Hz), 5.02 (1H, d, J=6.1 Hz),5.13 (2H, s), 6.75 (1H, d, J=8.8 Hz), 7.31-7.55 (6H, m).

Reference Example 54 Methyl4-[3-chloro-2-fluoro-4-(methoxymethyloxy)-5-methylphenyl]-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.22 (3H, dd, J=7.1, 0.9 Hz), 2.33 (3H, s), 2.44 (1H,dd, J=16.9, 5.4 Hz), 2.96 (1H, ddd, J=16.9, 8.8, 1.6 Hz), 3.64 (3H, s),3.65 (3H, s), 3.71-3.81 (1H, m), 5.15-5.19 (2H, m), 7.60 (1H, dd, J=8.0,0.7 Hz).

Reference Example 55 Production of methyl4-{3-chloro-5-fluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-3-methyl-4-oxobutanoate

Under an argon atmosphere, to3-chloro-5-fluoro-4-{[1-(triethylsilyloxy)cyclopropyl]methoxy}benzaldehyde(Reference example 20, 873 mg) were added trimethylsilyl cyanide (0.391mL) and lithium chloride (6 mg), and the mixture was stirred at 50° C.for 2 hours. The mixture was allowed to cool to room temperature, andTHF (10 mL) was added to the mixture. The mixture was stirred at −78° C.At the same temperature, lithium diisopropylamide (2.0 M, a mixedsolution of THF/heptane/ethylbenzene, 1.34 mL) was added to the mixture,and the mixture was stirred for 30 minutes. To the mixture was addedmethyl crotonate (0.284 mL) at −78° C., and the mixture was stirred for2 hours. Water was added to the mixture, and the mixture was extractedwith ethyl acetate. The organic layer was washed with brine, dried overanhydrous sodium sulfate, and filtrated, and the solvent was removed.The residue was dissolved in THF (10 mL), and tetrabutylammoniumfluoride (1.0 M THF solution, 2.92 mL) was added thereto. The reactionmixture was stirred at room temperature for one hour, and water wasadded thereto. The mixture was extracted with ethyl acetate. The organiclayer was washed with brine, dried over anhydrous sodium sulfate, andfiltrated, and the solvent was removed. The obtained crude product waspurified by silica gel column chromatography (heptane:ethylacetate=90:10 to 60:40) to afford the title compound as a pale yellowoil (352 mg).

¹H-NMR (CDCl₃) δ: 0.63-0.69 (2H, m), 0.92-0.98 (2H, m), 1.22 (3H, d,J=7.1 Hz), 2.47 (1H, dd, J=17.1, 5.1 Hz), 2.95 (1H, s), 2.98 (1H, dd,J=17.1, 9.0 Hz), 3.65 (3H, s), 3.76-3.86 (1H, m), 4.27 (2H, s), 7.67(1H, dd, J=11.4, 2.1 Hz), 7.83-7.85 (1H, m).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 55.

Reference Example 56 Methyl4-{2,3-difluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 0.72-0.78 (2H, m), 0.98-1.04 (2H, m), 1.22 (3H, d,J=7.1 Hz), 2.44 (1H, dd, J=16.8, 5.4 Hz), 2.77 (1H, s), 2.96 (1H, ddd,J=16.8, 8.8, 1.6 Hz), 3.65 (3H, s), 3.70-3.81 (1H, m), 4.15 (2H, s),6.78-6.86 (1H, m), 7.61-7.68 (1H, m).

Reference Example 57 Methyl4-{4-[(1-hydroxycyclopropyl)methoxy]-3,5-dimethylphenyl}-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 0.68-0.73 (2H, m), 0.94-1.00 (2H, m), 1.21 (3H, d,J=7.1 Hz), 2.35 (6H, s), 2.44 (1H, dd, J=16.8, 5.7 Hz), 2.79 (1H, s),2.95 (1H, dd, J=16.8, 8.5 Hz), 3.65 (3H, s), 3.85 (2H, s), 3.86-3.96(1H, m), 7.68 (2H, s).

Reference Example 58 Methyl4-{3-chloro-4-[(1-hydroxycyclopropyl)methoxy]-5-methylphenyl}-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 0.69-0.74 (2H, m), 0.95-1.00 (2H, m), 1.21 (3H, d,J=7.2 Hz), 2.40 (3H, s), 2.46 (1H, dd, J=17.0, 5.4 Hz), 2.92 (1H, s),2.96 (1H, dd, J=17.0, 8.9 Hz), 3.65 (3H, s), 3.79-3.90 (1H, m), 4.03(2H, s), 7.74 (1H, d, J=2.1 Hz), 7.86 (1H, d, J=2.1 Hz).

Reference Example 59 Methyl4-{3-fluoro-4-[(1-hydroxycyclopropyl)methoxy]-5-methylphenyl}-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 0.65-0.73 (2H, m), 0.92-0.98 (2H, m), 1.21 (3H, d,J=7.2 Hz), 2.38 (3H, s), 2.45 (1H, dd, J=17.0, 5.5 Hz), 2.73 (1H, s),2.96 (1H, dd, J=17.0, 8.7 Hz), 3.65 (3H, s), 3.79-3.91 (1H, m),4.16-4.18 (2H, m), 7.58 (1H, dd, J=12.0, 1.8 Hz), 7.61-7.64 (1H, m).

Reference Example 60 Methyl4-{2-fluoro-4-[(1-hydroxycyclopropyl)methoxy]-3-methylphenyl}-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 0.71-0.77 (2H, m), 0.96-1.02 (2H, m), 1.21 (3H, d,J=7.1 Hz), 2.21 (3H, d, J=2.3 Hz), 2.41 (1H, dd, J=16.7, 5.7 Hz), 2.59(1H, s), 2.94 (1H, ddd, J=16.7, 8.5, 1.7 Hz), 3.65 (3H, s), 3.76-3.87(1H, m), 4.05-4.13 (2H, m), 6.68 (1H, d, J=8.8 Hz), 7.72 (1H, t, J=8.8Hz).

Reference Example 61 Methyl4-{3-chloro-2-fluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 0.74-0.79 (2H, m), 0.99-1.05 (2H, m), 1.22 (3H, dd,J=7.1, 0.9 Hz), 2.44 (1H, dd, J=16.8, 5.3 Hz), 2.82 (1H, s), 2.96 (1H,ddd, J=16.8, 8.8, 1.8 Hz), 3.65 (3H, s), 3.72-3.83 (1H, m), 4.15 (2H,s), 6.80 (1H, dd, J=9.0, 1.3 Hz), 7.80 (1H, dd, J=9.0, 8.1 Hz).

Reference Example 62 Production of4-(3,5-dichloro-4-hydroxyphenyl)-3-methyl-4-oxobutanoic acid

Under an argon atmosphere, to3,5-dichloro-4-(methoxymethyloxy)benzaldehyde (Reference example 34,3.28 g) were added trimethylsilyl cyanide (2.25 mL) and lithium chloride(30 mg), and the mixture was stirred at 50° C. for 2 hours. The mixturewas allowed to cool to room temperature, and THF (40 mL) was added tothe mixture. Lithium diisopropylamide (2.0 M, a mixed solution ofTHF/heptane/ethylbenzene, 7.67 mL) was added to the mixture at −78° C.,and the mixture was stirred for 30 minutes at the same temperature. Tothe mixture was added methyl crotonate (1.63 mL) at −78° C., and themixture was stirred for 2 hours. To the reaction mixture was addedwater, and the mixture was extracted with ethyl acetate. The organiclayer was washed with brine, dried over anhydrous sodium sulfate. Thesolvent was removed and the obtained residue was dissolved in THF (40mL), and tetrabutylammonium fluoride (1.0 M THF solution, 16.7 mL) wasadded to the solution. The reaction mixture was stirred at roomtemperature for one hour. And then, to the reaction mixture was addedwater, and the mixture was extracted with ethyl acetate. The organiclayer was washed with brine, dried over anhydrous sodium sulfate, andfiltrated, and the solvent was removed. The residue was purified bysilica gel column chromatography (heptane:ethyl acetate=90:10 to 70:30),and the desired fractions were concentrated. The residue was added 1 Maqueous sodium hydroxide, and the aqueous solution was washed withmethylene chloride. The aqueous layer was acidified with 6 Mhydrochloric acid, and then the mixture was extracted with methylenechloride. The organic layer was washed with brine, dried over anhydroussodium sulfate, and filtrated, and the solvent was removed to afford thetitle compound as a white solid (1.16 g).

¹H-NMR (CDCl₃) δ: 1.23 (3H, d, J=7.3 Hz), 2.51 (1H, dd, J=17.2, 5.0 Hz),3.01 (1H, dd, J=17.2, 8.9 Hz), 3.72-3.85 (1H, m), 7.92 (2H, s).

Reference Example 63 Production of4-(2-fluoro-4-methoxy-3-methylphenyl)-3-methyl-4-oxobutanoic acid

To a mixture of methyl4-(2-fluoro-4-methoxy-3-methylphenyl)-3-methyl-4-oxobutanoate (Referenceexample 50, 7.8 g) in ethanol (60 mL) was added 5 M aqueous sodiumhydroxide (17.5 mL), and the mixture was stirred at room temperature forone hour. The reaction mixture was diluted with water, and the mixturewas acidified with 6 M hydrochloric acid at 0° C. The mixture wasextracted with ethyl acetate. The organic layer was washed with brine,dried over anhydrous sodium sulfate, and filtrated, and the solvent wasremoved to afford the title compound as a white solid (7.9 g).

¹H-NMR (DMSO-d6) δ: 1.08 (3H, d, J=7.1 Hz), 2.10 (3H, d, J=1.8 Hz), 2.36(1H, dd, J=16.8, 5.2 Hz), 2.69 (1H, dd, J=16.8, 8.9 Hz), 3.58-3.70 (1H,m), 3.90 (3H, s), 6.97 (1H, d, J=8.8 Hz), 7.71 (1H, t, J=8.8 Hz), 12.13(1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 63.

Reference Example 644-(3-Bromo-2-fluoro-4-methoxyphenyl)-3-methyl-4-oxobutanoic acid

¹H-NMR (DMSO-d6) δ: 1.09 (3H, d, J=7.1 Hz), 2.39 (1H, dd, J=17.0, 5.1Hz), 2.71 (1H, ddd, J=17.0, 8.9, 1.3 Hz), 3.58-3.69 (1H, m), 3.98 (3H,s), 7.12 (1H, dd, J=9.0, 1.0 Hz), 7.88 (1H, t, J=9.0 Hz), 12.17 (1H,brs).

Reference Example 654-(5-Chloro-2-fluoro-4-methoxy-3-methylphenyl)-3-methyl-4-oxobutanoicacid

¹H-NMR (DMSO-d6) δ: 1.09 (3H, d, J=7.1 Hz), 2.24 (3H, d, J=2.6 Hz), 2.41(1H, dd, J=17.0, 5.1 Hz), 2.70 (1H, ddd, J=17.0, 8.9, 1.3 Hz), 3.56-3.67(1H, m), 3.84 (3H, s), 7.70 (1H, d, J=7.6 Hz), 12.21 (1H, brs).

Reference Example 664-[4-Benzyloxy-2-(methoxymethyloxy)-3-methylphenyl]-3-methyl-4-oxobutanoicacid

¹H-NMR (CDCl₃) δ: 1.16 (3H, d, J=7.1 Hz), 2.26 (3H, s), 2.45 (1H, dd,J=16.6, 5.7 Hz), 2.90 (1H, dd, J=16.6, 7.8 Hz), 3.52 (3H, s), 3.85-3.97(1H, m), 4.95-5.02 (2H, m), 5.13 (2H, s), 6.76 (1H, d, J=8.5 Hz),7.31-7.53 (6H, m).

Reference Example 674-[4-Benzyloxy-3-chloro-2-(methoxymethyloxy)phenyl]-3-methyl-4-oxobutanoicacid

¹H-NMR (CDCl₃) δ: 1.16 (3H, d, J=7.1 Hz), 2.46 (1H, dd, J=16.7, 5.7 Hz),2.91 (1H, dd, J=16.7, 7.9 Hz), 3.56 (3H, s), 3.86-3.95 (1H, m), 5.13(2H, s), 5.21 (2H, s), 6.84 (1H, d, J=8.8 Hz), 7.32-7.49 (5H, m), 7.52(1H, d, J=8.8 Hz).

Reference Example 684-{2,3-Difluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-3-methyl-4-oxobutanoicacid

¹H-NMR (DMSO-d6) δ: 0.63-0.76 (4H, m), 1.10 (3H, d, J=7.1 Hz), 2.39 (1H,dd, J=17.0, 5.1 Hz), 2.71 (1H, dd, J=17.0, 8.5 Hz), 3.56-3.69 (1H, m),4.18 (2H, s), 5.67 (1H, s), 7.14-7.21 (1H, m), 7.60-7.67 (1H, m), 12.17(1H, brs).

Reference Example 694-{2-Fluoro-4-[(1-hydroxycyclopropyl)methoxy]-3-methylphenyl}-3-methyl-4-oxobutanoicacid

¹H-NMR (DMSO-d6) δ: 0.61-0.76 (4H, m), 1.08 (3H, d, J=7.1 Hz), 2.15 (3H,d, J=2.3 Hz), 2.35 (1H, dd, J=16.9, 5.3 Hz), 2.69 (1H, ddd, J=16.9, 8.9,1.2 Hz), 3.59-3.70 (1H, m), 4.09 (2H, s), 5.63 (1H, s), 6.94 (1H, d,J=8.9 Hz), 7.66 (1H, t, J=8.9 Hz), 12.12 (1H, s).

Reference Example 704-{3-Chloro-2-fluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-3-methyl-4-oxobutanoicacid

¹H-NMR (DMSO-d6) δ: 0.64-0.77 (4H, m), 1.09 (3H, d, J=7.1 Hz), 2.40 (1H,dd, J=17.0, 5.1 Hz), 2.70 (1H, ddd, J=17.0, 8.9, 1.1 Hz), 3.58-3.68 (1H,m), 4.21 (2H, s), 5.64 (1H, s), 7.18 (1H, dd, J=9.1, 1.0 Hz), 7.79 (1H,t, J=9.1 Hz), 12.18 (1H, brs).

Reference Example 71 Production of4-(3-chloro-4-hydroxy-5-methylphenyl)-3-methyl-4-oxobutanoic acid

To a mixture of methyl4-[4-(tert-butyldimethylsilyloxy)-3-chloro-5-methylphenyl]-3-methyl-4-oxobutanoate(Reference example 39, 500 mg) in methanol (10 mL) was added 5 M aqueoussodium hydroxide (0.520 mL). The reaction mixture was stirred at roomtemperature overnight, and then 5M aqueous sodium hydroxide (0.260 mL)was added to the reaction mixture. The reaction mixture was stirred atroom temperature for 3 hours, and then at 50° C. for 2 hours. Thereaction mixture was concentrated. To the obtained residue was addeddiethyl ether, and then the mixture was extracted with water. Theseparated aqueous layer was acidified with 6 M hydrochloric acid, andthen the mixture was extracted with ethyl acetate. The organic layer waswashed with water and brine, dried over anhydrous sodium sulfate, andfiltrated, and the solvent was removed to afford the title compound as apale yellow solid (317 mg).

¹H-NMR (DMSO-d6) δ: 1.06 (3H, d, J=7.1 Hz), 2.27 (3H, s), 2.36 (1H, dd,J=17.1, 4.9 Hz), 2.68 (1H, dd, J=17.1, 9.5 Hz), 3.75-3.88 (1H, m),7.74-7.75 (1H, m), 7.80 (1H, d, J=2.0 Hz), 10.12 (1H, brs), 12.13 (1H,brs).

Reference Example 72 Production of6-[3-chloro-2-fluoro-4-(methoxymethyloxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of methyl4-[3-chloro-2-fluoro-4-(methoxymethyloxy)-5-methylphenyl]-3-methyl-4-oxobutanoate(Reference example 54, 2.91 g) in ethanol (35 mL) was added 5 M aqueoussodium hydroxide (4.37 mL), and the reaction mixture was stirred at roomtemperature for 30 minutes. After cooling the reaction mixture at 0° C.,the reaction mixture was acidified with 6 M hydrochloric acid, and themixture was extracted with ethyl acetate. The organic layer was washedwith brine, dried over anhydrous sodium sulfate, and filtrated, and thesolvent was removed to afford a yellow oil (2.96 g). The oil wasdissolved in ethanol (30 mL), and hydrazine monohydrate (1.3 mL) andacetic acid (1.5 mL) were added to the solution. The mixture wasrefluxed for 2 hours. The reaction mixture was allowed to cool to roomtemperature, saturated aqueous sodium bicarbonate was added thereto at0° C., and then the mixture was extracted with ethyl acetate. Theorganic layer was washed with brine, dried over anhydrous sodiumsulfate, and filtrated, and the solvent was removed. The obtained crudeproduct was purified by silica gel column chromatography (heptane:ethylacetate=77:23 to 47:53) to afford the title compound as a white solid(1.65 g).

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 2.26 (1H, dd, J=16.7, 3.8Hz), 2.29 (3H, s), 2.70 (1H, dd, J=16.7, 6.8 Hz), 3.10-3.20 (1H, m),3.56 (3H, s), 5.13 (2H, s), 7.45 (1H, dd, J=8.5, 0.5 Hz), 11.08 (1H, s).

Reference Example 73 Production of6-(2-fluoro-4-methoxy-3-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of4-(2-fluoro-4-methoxy-3-methylphenyl)-3-methyl-4-oxobutanoic acid(Reference example 63, 4.6 g) in ethanol (60 mL) were added hydrazinemonohydrate (1.3 mL) and acetic acid (1.6 mL), and then the mixture wasrefluxed for 2 hours. The reaction mixture was allowed to cool to roomtemperature, and the obtained precipitates were collected on a filter toafford the title compound as a white solid (2.4 g).

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.2 Hz), 2.08 (3H, d, J=2.2 Hz), 2.23(1H, dd, J=16.8, 3.7 Hz), 2.66 (1H, dd, J=16.8, 6.8 Hz), 3.07-3.17 (1H,m), 3.85 (3H, s), 6.88 (1H, d, J=8.8 Hz), 7.40 (1H, t, J=8.8 Hz), 10.92(1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 73.

Reference Example 746-(3,5-Difluoro-4-methoxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 2.24 (1H, d, J=16.8 Hz),2.68 (1H, dd, J=16.8, 6.9 Hz), 3.33-3.44 (1H, m), 3.97 (3H, s),7.47-7.57 (2H, m), 11.05 (1H, s).

Reference Example 756-(3-Chloro-5-fluoro-4-methoxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 2.24 (1H, d, J=16.8 Hz),2.69 (1H, dd, J=16.8, 6.9 Hz), 3.36-3.45 (1H, m), 3.94 (3H, d, J=1.6Hz), 7.62-7.71 (2H, m), 11.07 (1H, s).

Reference Example 766-(3-Chloro-2-fluoro-4-methoxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.25 (1H, dd, J=16.8, 3.6Hz), 2.70 (1H, dd, J=16.8, 6.8 Hz), 3.09-3.20 (1H, m), 3.93 (3H, s),7.09 (1H, d, J=9.0 Hz), 7.57 (1H, t, J=9.0 Hz), 11.03 (1H, s).

Reference Example 776-(2,4-Dimethoxy-3-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.08 (3H, d, J=7.3 Hz), 2.16 (3H, s), 2.43 (1H, dd,J=16.9, 4.5 Hz), 2.75 (1H, dd, J=16.9, 6.8 Hz), 3.28-3.38 (1H, m), 3.70(3H, s), 3.85 (3H, s), 6.67 (1H, d, J=8.5 Hz), 7.15 (1H, d, J=8.5 Hz),8.48 (1H, brs).

Reference Example 786-(3-Chloro-2,4-dimethoxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.10 (3H, d, J=7.3 Hz), 2.44 (1H, dd, J=17.0, 4.5 Hz),2.75 (1H, dd, J=17.0, 6.8 Hz), 3.26-3.36 (1H, m), 3.85 (3H, s), 3.94(3H, s), 6.77 (1H, d, J=8.5 Hz), 7.24 (1H, d, J=8.5 Hz), 8.45 (1H, brs).

Reference Example 796-[4-(Methoxymethyloxy)-3,5-dimethylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 2.22 (1H, d, J=16.9 Hz),2.26 (6H, s), 2.65 (1H, dd, J=16.9, 6.8 Hz), 3.33-3.41 (1H, m), 3.51(3H, s), 4.96 (2H, s), 7.46 (2H, s), 10.88 (1H, s).

Reference Example 806-(3,5-Dichloro-4-hydroxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.3 Hz), 2.21 (1H, d, J=16.7 Hz),2.67 (1H, dd, J=16.7, 7.0 Hz), 3.26-3.46 (1H, m), 7.73 (2H, s), 10.57(1H, s), 10.97 (1H, s).

Reference Example 816-(3-Fluoro-4-methoxy-5-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 2.23 (1H, d, J=16.9 Hz),2.27 (3H, s), 2.67 (1H, dd, J=16.9, 6.9 Hz), 3.32-3.42 (1H, m), 3.86(3H, d, J=1.7 Hz), 7.42-7.50 (2H, m), 10.96 (1H, s).

Reference Example 826-(5-Chloro-2-fluoro-4-methoxy-3-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.21-2.29 (1H, m), 2.21 (3H,d, J=2.3 Hz), 2.69 (1H, dd, J=16.8, 6.8 Hz), 3.08-3.19 (1H, m), 3.80(3H, s), 7.52 (1H, d, J=7.9 Hz), 11.07 (1H, s).

Reference Example 83 Production of6-[4-benzyloxy-2-(methoxymethyloxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

A mixture of4-[4-benzyloxy-2-(methoxymethyloxy)-3-methylphenyl]-3-methyl-4-oxobutanoicacid (Reference example 66, 3.20 g) and hydrazine monohydrate (0.626 mL)in ethanol (30 mL) was stirred at room temperature for 3 days. Theprecipitates were collected on a filter to afford the title compound asa white solid (1.56 g).

¹H-NMR (CDCl₃) δ: 1.10 (3H, d, J=7.3 Hz), 2.28 (3H, s), 2.44 (1H, dd,J=16.9, 4.6 Hz), 2.82 (1H, dd, J=17.0, 7.0 Hz), 3.31-3.41 (1H, m), 3.53(3H, s), 4.92 (1H, d, J=5.6 Hz), 5.03 (1H, d, J=5.6 Hz), 5.13 (2H, s),6.78 (1H, d, J=8.5 Hz), 7.16 (1H, d, J=8.5 Hz), 7.33-7.49 (5H, m), 8.42(1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 83.

Reference Example 846-(3-Bromo-2-fluoro-4-methoxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.25 (1H, dd, J=16.9, 3.7Hz), 2.69 (1H, dd, J=16.9, 6.8 Hz), 3.09-3.19 (1H, m), 3.92 (3H, s),7.05 (1H, dd, J=8.9, 1.2 Hz), 7.60 (1H, t, J=8.9 Hz), 11.02 (1H, s).

Reference Example 856-[4-Benzyloxy-3-chloro-2-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.07 (3H, d, J=7.3 Hz), 2.42 (1H, dd, J=17.0, 4.8 Hz),2.80 (1H, dd, J=17.0, 7.0 Hz), 3.30-3.41 (1H, m), 3.53 (3H, s), 5.03(1H, d, J=5.6 Hz), 5.15-5.22 (3H, m), 6.82 (1H, d, J=8.8 Hz), 7.19 (1H,d, J=8.5 Hz), 7.31-7.49 (5H, m), 8.45 (1H, s).

Reference Example 86 Production of6-(3-chloro-4-hydroxy-5-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of methyl4-[4-(tert-butyldimethylsilyloxy)-3-chloro-5-methylphenyl]-3-methyl-4-oxobutanoate(Reference example 39, 2.7 g) in ethanol (35 mL) were added hydrazinemonohydrate (1.0 mL) and acetic acid (1.2 mL), and then the mixture wasrefluxed for 5 hours. The reaction mixture was allowed to cool to roomtemperature, saturated aqueous sodium bicarbonate was added thereto at0° C., and then the mixture was extracted with ethyl acetate. Theorganic layer was washed with brine, dried over anhydrous sodiumsulfate, and filtrated. The solvent was removed. The obtained crudesolid was washed by trituration with diisopropyl ether, and thencollected on a filter to afford the title compound as a white solid (1.5g).

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.2 Hz), 2.20 (1H, d, J=16.8 Hz),2.24 (3H, s), 2.65 (1H, dd, J=16.8, 6.9 Hz), 3.27-3.40 (1H, m), 7.50(1H, d, J=2.2 Hz), 7.58 (1H, d, J=2.2 Hz), 9.47 (1H, brs), 10.86 (1H,s).

Reference Example 87 Production of6-(3-bromo-5-chloro-4-hydroxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of methyl4-[3-bromo-5-chloro-4-(methoxymethyloxy)phenyl]-3-methyl-4-oxobutanoate(Reference example 41, 1.15 g) in ethanol (15 mL) were added acetic acid(0.518 mL) and hydrazine monohydrate (0.440 mL), and then the mixturewas refluxed for 13 hours. The reaction mixture was concentrated, waterwas added to the residue, and then the mixture was extracted with ethylacetate. The organic layer was washed with water and brine, dried overanhydrous sodium sulfate, and filtrated, and the solvent was removed.The residue was recrystallized from heptane/ethyl acetate to afford thetitle compound as a pale yellow solid (713 mg).

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.3 Hz), 2.18-2.24 (1H, m), 2.66 (1H,dd, J=16.9, 6.8 Hz), 3.30-3.45 (1H, m), 7.76 (1H, d, J=2.2 Hz), 7.87(1H, d, J=2.2 Hz), 10.50 (1H, brs), 10.98 (1H, s).

The following compound was prepared from the appropriate startingmaterial in a similar manner to Reference example 87.

Reference Example 886-(3-Bromo-5-fluoro-4-hydroxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.3 Hz), 2.21 (1H, d, J=16.7 Hz),2.67 (1H, dd, J=16.7, 6.8 Hz), 3.32-3.41 (1H, m), 7.59 (1H, dd, J=12.2,2.1 Hz), 7.73 (1H, t, J=2.1 Hz), 10.85 (1H, brs), 10.95 (1H, s).

Reference Example 89 Production of6-(3-chloro-2-fluoro-4-hydroxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of6-(3-chloro-2-fluoro-4-methoxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 76, 1.4 g) in methylene chloride (50 mL) was addedaluminum chloride (14.2 g) at 0° C. Under an argon atmosphere, thereaction mixture was stirred at room temperature overnight. Aftercooling the reaction mixture at 0° C., ice in water and 5 M aqueoussodium hydroxide were added thereto. The separated aqueous layer wasacidified with 6 M hydrochloric acid at 0° C., and then the mixture wasextracted with ethyl acetate/THF. The organic layer was washed withbrine, dried over anhydrous sodium sulfate, and filtrated, and thesolvent was removed. The obtained solid was washed by trituration withethanol, and then collected on a filter to afford the title compound asa pale yellow solid (0.9 g).

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.23 (1H, dd, J=16.8, 3.4Hz), 2.67 (1H, dd, J=16.8, 6.8 Hz), 3.06-3.18 (1H, m), 6.87 (1H, dd,J=8.8, 1.3 Hz), 7.41 (1H, t, J=8.8 Hz), 10.98 (1H, s), 11.04 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 89.

Reference Example 906-(3,5-Difluoro-4-hydroxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.2 Hz), 2.21 (1H, d, J=16.8 Hz),2.66 (1H, dd, J=16.8, 6.9 Hz), 3.29-3.41 (1H, m), 7.39-7.50 (2H, m),10.63 (1H, brs), 10.95 (1H, s).

Reference Example 916-(3-Chloro-5-fluoro-4-hydroxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.3 Hz), 2.21 (1H, d, J=16.7 Hz),2.67 (1H, dd, J=16.7, 7.0 Hz), 3.30-3.43 (1H, m), 7.51-7.65 (2H, m),10.83 (1H, brs), 10.96 (1H, s).

Reference Example 92 Production of6-(2-fluoro-4-hydroxy-3-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Under an argon atmosphere, to a mixture of6-(2-fluoro-4-methoxy-3-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 73, 3.6 g) in methylene chloride (80 mL) was addeddropwise boron tribromide (1 M methylene chloride solution, 100 mL) at0° C., and then the mixture was stirred at room temperature for 3 days.To the reaction mixture was added ice in water, and the mixture wasstirred at room temperature for 30 minutes. The mixture was extractedwith a mixture of ethyl acetate/THF, and then the solvent was removed.The residue was dissolved in 1 M aqueous sodium hydroxide, and thenwashed with methylene chloride. To the separated aqueous layer wasacidified with 6 M hydrochloric acid at 0° C., and then the mixture wasextracted with ethyl acetate/THF. The organic layer was washed withbrine, dried over anhydrous sodium sulfate, and filtrated, and thesolvent was removed. The obtained solid was washed by trituration withdiisopropyl ether, and then collected on a filter to afford the titlecompound as a gray solid (2.7 g).

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.1 Hz), 2.05 (3H, d, J=2.2 Hz), 2.21(1H, dd, J=16.7, 3.4 Hz), 2.63 (1H, dd, J=16.7, 6.6 Hz), 3.05-3.16 (1H,m), 6.68 (1H, d, J=8.4 Hz), 7.24 (1H, t, J=8.4 Hz), 10.12 (1H, d, J=2.0Hz), 10.86 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 92.

Reference Example 936-(2,4-Dihydroxy-3-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.09 (3H, d, J=7.3 Hz), 1.98 (3H, s), 2.21-2.28 (1H,m), 2.73 (1H, dd, J=16.9, 6.6 Hz), 3.41-3.51 (1H, m), 6.43 (1H, d, J=8.5Hz), 7.27 (1H, d, J=8.5 Hz), 9.80 (1H, s), 10.97 (1H, s), 12.48 (1H, s).

Reference Example 946-(3-Bromo-2-fluoro-4-hydroxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.23 (1H, dd, J=16.8, 3.5Hz), 2.67 (1H, dd, J=16.8, 6.7 Hz), 3.06-3.17 (1H, m), 6.84 (1H, dd,J=8.7, 1.3 Hz), 7.44 (1H, t, J=8.7 Hz), 10.96 (1H, s), 11.07 (1H, d,J=1.7 Hz).

Reference Example 956-(3-Fluoro-4-hydroxy-5-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 2.20 (1H, d, J=16.7 Hz),2.21 (3H, s), 2.64 (1H, dd, J=16.7, 6.8 Hz), 3.29-3.39 (1H, m),7.34-7.44 (2H, m), 9.79 (1H, s), 10.85 (1H, s).

Reference Example 966-(5-Chloro-2-fluoro-4-hydroxy-3-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.2 Hz), 2.14 (3H, d, J=2.4 Hz), 2.22(1H, dd, J=16.7, 3.7 Hz), 2.66 (1H, dd, J=16.7, 6.7 Hz), 3.07-3.17 (1H,m), 7.41 (1H, d, J=7.9 Hz), 10.00 (1H, s), 10.96 (1H, s).

Reference Example 97 Production of6-(3-chloro-2,4-dihydroxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Under an argon atmosphere, to a mixture of6-(3-chloro-2,4-dimethoxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 78, 2.55 g) in methylene chloride (100 mL) was addeddropwise boron tribromide (1 M methylene chloride solution, 45.1 mL) at0° C. The mixture was stirred at room temperature for 3 days. Thereaction was quenched by adding methanol slowly at 0° C., and then thesolvent was removed. The residue was diluted with ethyl acetate, washedwith water and brine, dried over anhydrous sodium sulfate, andfiltrated. And, the solvent was removed. The mixture was dissolved inDMF (15 mL), lithium chloride (1.91 g) was added thereto. The mixturewas stirred at 240° C. under microwave irradiation for 30 minutes. Tothe reaction mixture was added water, and the mixture was extracted withethyl acetate. The organic layer was washed with water and brine, driedover anhydrous sodium sulfate, and filtrated, and the solvent wasremoved. The obtained crude product was purified by silica gel columnchromatography (heptane:ethyl acetate=67:33 to 33:67), and thenrecrystallized from ethanol to afford the title compound as a whitesolid (1.21 g).

¹H-NMR (DMSO-d6) δ: 1.10 (3H, d, J=7.3 Hz), 2.27 (1H, d, J=16.1 Hz),2.78 (1H, dd, J=16.7, 6.7 Hz), 3.41-3.56 (1H, m), 6.57 (1H, d, J=8.9Hz), 7.42 (1H, d, J=8.9 Hz), 10.67 (1H, brs), 11.07 (1H, s), 13.03 (1H,s).

Reference Example 98 Production of6-[4-hydroxy-2-(methoxymethyloxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

A mixture of6-[4-benzyloxy-2-(methoxymethyloxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 83, 1.55 g) and palladium-carbon (10% w/w, 100 mg) inethanol/THF (1:1, 40 mL) was allowed to be under a hydrogen atmosphere.The mixture was stirred at room temperature for 2 hours, and thenstirred at 40° C. for 2 hours. The mixture was filtered through a Celitepad, and the filtrate was concentrated. The residual solid was washed bytrituration with diethyl ether, and then collected on a filter to affordthe title compound as a white solid (1.13 g).

¹H-NMR (DMSO-d6) δ: 0.90 (3H, d, J=7.1 Hz), 2.07 (3H, s), 2.21 (1H, dd,J=16.7, 4.8 Hz), 2.63 (1H, dd, J=16.6, 6.8 Hz), 3.09-3.20 (1H, m), 3.41(3H, s), 4.87-4.92 (2H, m), 6.64 (1H, d, J=8.3 Hz), 6.96 (1H, d, J=8.3Hz), 9.73 (1H, s), 10.76 (1H, s).

The following compound was prepared from the appropriate startingmaterial in a similar manner to Reference example 98.

Reference Example 996-[3-Chloro-4-hydroxy-2-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.08 (3H, d, J=7.3 Hz), 2.42 (1H, dd, J=17.0, 4.6 Hz),2.79 (1H, dd, J=17.0, 7.0 Hz), 3.27-3.39 (1H, m), 3.54 (3H, s), 5.02(1H, d, J=5.6 Hz), 5.14 (1H, d, J=5.6 Hz), 5.84 (1H, brs), 6.88 (1H, d,J=8.5 Hz), 7.19 (1H, d, J=8.5 Hz), 8.47 (1H, s).

Reference Example 1006-[3-Bromo-2-fluoro-4-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of6-(3-bromo-2-fluoro-4-hydroxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 94, 2.37 g) in methylene chloride (30 mL) were addedN,N-diisopropylethylamine (2.06 mL) and chloromethyl methyl ether (1.16mL), and then the mixture was stirred at room temperature for 3 hours.To the reaction mixture was added water, and the mixture was extractedwith ethyl acetate. The organic layer was washed with water and brine,dried over anhydrous sodium sulfate, and filtrated, and the solvent wasremoved. The obtained crude product was purified by silica gel columnchromatography (heptane:ethyl acetate=80:20 to 67:33) to afford thetitle compound as a white solid (1.97 g).

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 2.25 (1H, dd, J=16.9, 3.7Hz), 2.69 (1H, dd, J=16.9, 6.8 Hz), 3.08-3.20 (1H, m), 3.42 (3H, s),5.38 (2H, s), 7.12 (1H, dd, J=8.8, 1.2 Hz), 7.59 (1H, t, J=8.8 Hz),11.05 (1H, brs).

Reference Example 101 Production of6-[2-fluoro-4-(methoxymethyloxy)-3-vinylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of6-[3-bromo-2-fluoro-4-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 100, 4.87 g) in 1,2-dimethoxyethane/water (3:1, 32mL) were added potassium vinyltrifluoroborate (3.78 g), potassiumcarbonate (4.87 g), and[1,1′-bis(diphenylphosphino)ferrocene]palladium(II) dichloride complexwith methylene chloride (1.15 g). Then, the mixture was stirred at 150°C. under microwave irradiation for one hour. The reaction mixture waspoured into water/ethyl acetate, and then the mixture was filteredthrough a Celite pad. And, the filtrate was extracted with ethylacetate. The organic layer was washed with water and brine, dried overanhydrous sodium sulfate, and filtrated, and the solvent was removed.The obtained crude product was purified by silica gel columnchromatography (heptane:ethyl acetate=80:20 to 67:33) to afford thetitle compound as a pale yellow solid (3.01 g).

¹H-NMR (CDCl₃) δ: 1.20 (3H, d, J=7.1 Hz), 2.43 (1H, dd, J=16.9, 3.4 Hz),2.74 (1H, dd, J=16.9, 6.6 Hz), 3.21-3.33 (1H, m), 3.50 (3H, s), 5.26(2H, s), 5.54-5.60 (1H, m), 5.98-6.08 (1H, m), 6.81 (1H, dd, J=18.1,12.0 Hz), 6.95 (1H, dd, J=8.8, 1.0 Hz), 7.37 (1H, t, J=8.8 Hz), 8.60(1H, brs).

Reference Example 102 Production of6-[3-ethyl-2-fluoro-4-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of6-[2-fluoro-4-(methoxymethyloxy)-3-vinylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 101, 292 mg) in ethanol (10 mL) was addedplatinum-carbon (1 w/w %, 195 mg). The reaction mixture was stirred atroom temperature for 4 hours under a hydrogen atmosphere. The reactionmixture was filtered through a Celite pad, and then the filtrate wasconcentrated to afford the title compound as a white solid (280 mg).

¹H-NMR (CDCl₃) δ: 1.16 (3H, t, J=7.6 Hz), 1.20 (3H, d, J=7.3 Hz), 2.42(1H, dd, J=16.9, 3.4 Hz), 2.66-2.79 (3H, m), 3.21-3.34 (1H, m), 3.49(3H, s), 5.24 (2H, s), 6.90 (1H, dd, J=8.8, 1.0 Hz), 7.33 (1H, t, J=8.8Hz), 8.53 (1H, brs).

Reference Example 103 Production of6-(3-ethyl-2-fluoro-4-hydroxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of6-[3-ethyl-2-fluoro-4-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 102, 280 mg) in ethanol (10 mL) was added 6 Mhydrochloric acid (0.476 mL), and then the mixture was stirred at 60° C.for 7 hours. To the reaction mixture was added water, and then themixture was extracted with ethyl acetate. The organic layer was washedwith water and brine, dried over anhydrous sodium sulfate, and thenfiltrated, and the solvent was removed. The obtained crude product waspurified by silica gel column chromatography (heptane:ethylacetate=33:67 to 17:83) to afford the title compound as a white solid(151 mg).

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.3 Hz), 1.08 (3H, t, J=7.3 Hz), 2.20(1H, dd, J=16.9, 3.7 Hz), 2.52-2.68 (3H, m), 3.04-3.18 (1H, m), 6.68(1H, d, J=8.5 Hz), 7.24 (1H, t, J=8.8 Hz), 10.09 (1H, brs), 10.87 (1H,brs).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 103.

Reference Example 1046-(4-Hydroxy-3,5-dimethylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 2.19 (6H, s), 2.19 (1H, d,J=16.7 Hz), 2.61 (1H, dd, J=16.7, 6.8 Hz), 3.27-3.38 (1H, m), 7.36 (2H,s), 8.59 (1H, s), 10.75 (1H, s).

Reference Example 1056-(2-Fluoro-4-hydroxy-3-vinylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.3 Hz), 2.21 (1H, dd, J=16.9, 3.7Hz), 2.64 (1H, dd, J=16.9, 6.8 Hz), 3.04-3.16 (1H, m), 5.45-5.53 (1H,m), 5.96-6.05 (1H, m), 6.71-6.81 (2H, m), 7.30 (1H, t, J=8.8 Hz), 10.56(1H, d, J=1.2 Hz), 10.91 (1H, s).

Reference Example 1066-(3-Chloro-2-fluoro-4-hydroxy-5-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.19-2.27 (1H, m), 2.20 (3H,s), 2.67 (1H, dd, J=16.7, 6.7 Hz), 3.08-3.18 (1H, m), 7.32 (1H, d, J=8.8Hz), 10.02 (1H, s), 10.97 (1H, s).

Reference Example 107 Production of6-[2-(methoxymethyloxy)-3-methyl-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of6-[4-hydroxy-2-(methoxymethyloxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 98, 140 mg) and potassium carbonate (83 mg) in DMF (3mL) was added bromoacetone (0.052 mL) at 0° C., and the mixture wasstirred at the same temperature for 2 hours. The reaction mixture waspoured into water, and the mixture was extracted with ethyl acetate. Theorganic layer was washed with water and brine, dried over anhydroussodium sulfate, and filtrated, and the solvent was removed. The obtainedcrude product was purified by silica gel column chromatography(heptane:ethyl acetate=60:40 to 40:60). The obtained solid was washed bytrituration with diethyl ether, and then collected on a filter to affordthe title compound as a white solid (120 mg).

¹H-NMR (CDCl₃) δ: 1.07 (3H, d, J=7.3 Hz), 2.28 (3H, s), 2.32 (3H, s),2.41 (1H, dd, J=17.0, 4.6 Hz), 2.79 (1H, dd, J=17.0, 7.0 Hz), 3.26-3.37(1H, m), 3.51 (3H, s), 4.56 (2H, s), 4.90 (1H, d, J=5.6 Hz), 5.00 (1H,d, J=5.6 Hz), 6.52 (1H, d, J=8.5 Hz), 7.13 (1H, d, J=8.5 Hz), 8.42 (1H,s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 107.

Reference Example 1086-[2,3-Difluoro-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 2.16 (3H, s), 2.25 (1H, dd,J=16.7, 3.3 Hz), 2.70 (1H, dd, J=16.7, 6.8 Hz), 3.10-3.23 (1H, m), 5.04(2H, s), 6.91-7.01 (1H, m), 7.28-7.38 (1H, m), 11.03 (1H, s).

Reference Example 1096-[3,5-Dichloro-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 2.20-2.28 (1H, m), 2.23 (3H,s), 2.70 (1H, dd, J=16.7, 7.0 Hz), 3.37-3.49 (1H, m), 4.73 (2H, s), 7.84(2H, s), 11.10 (1H, s).

Reference Example 1106-[3-Chloro-2-fluoro-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.1 Hz), 2.18 (3H, s), 2.25 (1H, dd,J=16.6, 3.7 Hz), 2.69 (1H, dd, J=16.6, 6.8 Hz), 3.10-3.19 (1H, m), 5.06(2H, s), 6.95 (1H, dd, J=8.9, 1.5 Hz), 7.49 (1H, t, J=8.9 Hz), 11.03(1H, s).

Reference Example 1116-[3-Chloro-2-(methoxymethyloxy)-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.08 (3H, d, J=7.3 Hz), 2.37 (3H, s), 2.42 (1H, dd,J=17.0, 4.9 Hz), 2.80 (1H, dd, J=17.0, 7.0 Hz), 3.29-3.40 (1H, m), 3.54(3H, s), 4.60 (2H, s), 5.04 (1H, d, J=5.6 Hz), 5.18 (1H, d, J=5.6 Hz),6.63 (1H, d, J=8.8 Hz), 7.22 (1H, d, J=8.8 Hz), 8.44 (1H, s).

Reference Example 1126-[3-Chloro-5-fluoro-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 2.17 (3H, s), 2.24 (1H, d,J=16.8 Hz), 2.69 (1H, dd, J=16.8, 6.9 Hz), 3.35-3.45 (1H, m), 4.95 (2H,d, J=2.0 Hz), 7.62 (1H, dd, J=13.2, 2.1 Hz), 7.67-7.71 (1H, m), 11.06(1H, s).

Reference Example 1136-[3-Bromo-5-fluoro-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 2.19 (3H, s), 2.23 (1H, d,J=16.8 Hz), 2.69 (1H, dd, J=16.8, 6.9 Hz), 3.34-3.45 (1H, m), 4.92 (2H,d, J=2.1 Hz), 7.65 (1H, dd, J=13.4, 2.1 Hz), 7.82 (1H, t, J=2.1 Hz),11.06 (1H, s).

Reference Example 1146-[3-Bromo-2-fluoro-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.19 (3H, s), 2.25 (1H, dd,J=16.8, 3.7 Hz), 2.69 (1H, dd, J=16.8, 6.7 Hz), 3.08-3.19 (1H, m), 5.04(2H, s), 6.90 (1H, dd, J=8.9, 1.2 Hz), 7.52 (1H, t, J=8.9 Hz), 11.02(1H, s).

Reference Example 1156-[3,5-Dimethyl-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 2.17 (3H, s), 2.22 (1H, d,J=16.8 Hz), 2.24 (6H, s), 2.64 (1H, dd, J=16.8, 6.8 Hz), 3.31-3.42 (1H,m), 4.52 (2H, s), 7.45 (2H, s), 10.88 (1H, s).

Reference Example 1166-[3-Fluoro-5-methyl-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 2.14 (3H, s), 2.22 (1H, d,J=16.7 Hz), 2.31 (3H, s), 2.66 (1H, dd, J=16.7, 6.8 Hz), 3.32-3.42 (1H,m), 4.84 (2H, d, J=1.7 Hz), 7.40-7.48 (2H, m), 10.95 (1H, s).

Reference Example 1176-[3-Chloro-5-methyl-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.24 (3H, d, J=7.3 Hz), 2.36 (3H, s), 2.38 (3H, s),2.47 (1H, dd, J=17.1, 1.2 Hz), 2.69 (1H, dd, J=17.1, 6.8 Hz), 3.23-3.33(1H, m), 4.51 (2H, s), 7.50 (1H, d, J=2.2 Hz), 7.62 (1H, d, J=2.2 Hz),8.73 (1H, brs).

Reference Example 1186-[3-Bromo-5-chloro-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.25 (3H, d, J=7.3 Hz), 2.45 (3H, s), 2.45-2.55 (1H,m), 2.70 (1H, dd, J=17.1, 6.8 Hz), 3.20-3.31 (1H, m), 4.54 (2H, s), 7.75(1H, d, J=2.2 Hz), 7.87 (1H, d, J=2.2 Hz), 8.58 (1H, brs).

Reference Example 1196-[2-Fluoro-3-methyl-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.2 Hz), 2.14 (3H, d, J=2.0 Hz), 2.18(3H, s), 2.23 (1H, dd, J=16.9, 3.6 Hz), 2.66 (1H, dd, J=16.9, 6.7 Hz),3.07-3.17 (1H, m), 4.92 (2H, s), 6.74 (1H, d, J=8.7 Hz), 7.33 (1H, t,J=8.7 Hz), 10.93 (1H, s).

Reference Example 1206-[2-Fluoro-4-(2-oxopropoxy)-3-vinylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.20 (3H, d, J=6.8 Hz), 2.31 (3H, s), 2.43 (1H, dd,J=17.1, 3.7 Hz), 2.74 (1H, dd, J=17.1, 6.8 Hz), 3.21-3.33 (1H, m), 4.63(2H, s), 5.59-5.66 (1H, m), 6.06-6.13 (1H, m), 6.56 (1H, dd, J=8.8, 1.0Hz), 6.85 (1H, dd, J=18.1, 12.0 Hz), 7.39 (1H, t, J=8.8 Hz), 8.58 (1H,brs).

Reference Example 1216-[3-Ethyl-2-fluoro-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.16-1.24 (6H, m), 2.31 (3H, s), 2.42 (1H, dd, J=16.9,3.4 Hz), 2.69-2.83 (3H, m), 3.20-3.33 (1H, m), 4.58 (2H, s), 6.51 (1H,d, J=8.8 Hz), 7.35 (1H, t, J=8.8 Hz), 8.48 (1H, brs).

Reference Example 1226-[2,3-Difluoro-4-(2-oxobutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.98 (3H, t, J=7.3 Hz), 1.05 (3H, d, J=7.1 Hz), 2.25(1H, dd, J=16.7, 3.3 Hz), 2.48-2.58 (2H, m), 2.70 (1H, dd, J=16.7, 6.8Hz), 3.09-3.22 (1H, m), 5.05 (2H, s), 6.89-7.01 (1H, m), 7.29-7.38 (1H,m), 11.03 (1H, s).

Reference Example 1236-[3-Chloro-5-fluoro-4-(2-oxobutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.98 (3H, t, J=7.3 Hz), 1.04 (3H, d, J=7.3 Hz), 2.24(1H, d, J=16.9 Hz), 2.54 (2H, q, J=7.3 Hz), 2.69 (1H, dd, J=16.9, 7.1Hz), 3.34-3.45 (1H, m), 4.96 (2H, d, J=2.0 Hz), 7.58-7.64 (1H, m),7.67-7.72 (1H, m), 11.06 (1H, s).

Reference Example 1246-[3,5-Dichloro-4-(2-oxobutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.00 (3H, t, J=7.3 Hz), 1.04 (3H, d, J=7.3 Hz), 2.24(1H, d, J=16.9 Hz), 2.62 (2H, q, J=7.3 Hz), 2.70 (1H, dd, J=16.9, 7.1Hz), 3.38-3.49 (1H, m), 4.75 (2H, s), 7.84 (2H, s), 11.10 (1H, s).

Reference Example 1256-[3-Chloro-2-fluoro-4-(2-oxobutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.98 (3H, t, J=7.2 Hz), 1.04 (3H, d, J=7.3 Hz), 2.25(1H, dd, J=16.7, 3.7 Hz), 2.56 (2H, q, J=7.2 Hz), 2.69 (1H, dd, J=16.7,6.7 Hz), 3.10-3.19 (1H, m), 5.07 (2H, s), 6.94 (1H, dd, J=8.8, 1.5 Hz),7.49 (1H, t, J=8.8 Hz), 11.03 (1H, s).

Reference Example 1266-[3-Chloro-5-methyl-4-(2-oxobutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.17 (3H, t, J=7.3 Hz), 1.24 (3H, d, J=7.3 Hz), 2.36(3H, s), 2.47 (1H, dd, J=17.1, 1.0 Hz), 2.65-2.80 (3H, m), 3.23-3.33(1H, m), 4.53 (2H, s), 7.49 (1H, dd, J=2.2, 0.7 Hz), 7.62 (1H, d, J=2.2Hz), 8.76 (1H, brs).

Reference Example 1276-[3-Bromo-5-chloro-4-(2-oxobutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.17 (3H, t, J=7.3 Hz), 1.25 (3H, d, J=7.3 Hz), 2.49(1H, dd, J=16.9, 1.0 Hz), 2.70 (1H, dd, J=16.9, 6.8 Hz), 2.83 (2H, q,J=7.3 Hz), 3.20-3.31 (1H, m), 4.57 (2H, s), 7.75 (1H, d, J=2.2 Hz), 7.87(1H, d, J=2.2 Hz), 8.77 (1H, brs).

Reference Example 1286-[2-Fluoro-4-(2-oxobutoxy)-3-vinylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.13 (3H, t, J=7.3 Hz), 1.20 (3H, d, J=7.1 Hz), 2.43(1H, dd, J=16.9, 3.4 Hz), 2.63 (2H, q, J=7.3 Hz), 2.73 (1H, dd, J=16.9,6.6 Hz), 3.21-3.33 (1H, m), 4.65 (2H, s), 5.59-5.66 (1H, m), 6.06-6.15(1H, m), 6.54-6.59 (1H, m), 6.85 (1H, dd, J=18.1, 12.0 Hz), 7.39 (1H, t,J=8.5 Hz), 8.64 (1H, brs).

Reference Example 129 Production of methyl3-[2-bromo-6-chloro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-dimethylpropionate

A suspension of6-(3-bromo-5-chloro-4-hydroxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 87, 500 mg), methyl2,2-dimethyl-3-(methylsulfonyloxy)propanoate (430 mg), and cesiumcarbonate (769 mg) in NMP (4 mL) was stirred at 150° C. under microwaveirradiation for 1.5 hours. To the reaction mixture was added water, andthe mixture was extracted with ethyl acetate. The organic layer waswashed with saturated aqueous sodium bicarbonate and brine, dried overanhydrous sodium sulfate, and filtrated, and the solvent was removed.The obtained crude product was purified by silica gel columnchromatography (heptane:ethyl acetate=50:50 to 33:67) to afford thetitle compound as a pale yellow solid (342 mg).

¹H-NMR (CDCl₃) δ 1.24 (3H, d, J=7.6 Hz), 1.41 (6H, s), 2.48 (1H, dd,J=17.1, 1.0 Hz), 2.69 (1H, dd, J=17.1, 6.8 Hz), 3.20-3.30 (1H, m), 3.74(3H, s), 4.08 (2H, s), 7.72 (1H, d, J=2.2 Hz), 7.84 (1H, d, J=2.2 Hz),8.67 (1H, brs).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 129.

Reference Example 130 Methyl3-[2-bromo-6-fluoro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-dimethylpropionate

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 1.28 (6H, s), 2.23 (1H, d,J=16.8 Hz), 2.69 (1H, dd, J=16.8, 6.9 Hz), 3.35-3.45 (1H, m), 3.63 (3H,s), 4.16 (2H, d, J=1.5 Hz), 7.67 (1H, dd, J=12.8, 2.1 Hz), 7.80 (1H, t,J=2.1 Hz), 11.07 (1H, s).

Reference Example 131 Methyl3-[2-bromo-3-fluoro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-dimethylpropionate

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 1.29 (6H, s), 2.25 (1H, dd,J=16.8, 3.7 Hz), 2.69 (1H, dd, J=16.8, 6.8 Hz), 3.09-3.20 (1H, m), 3.63(3H, s), 4.14 (2H, s), 7.05 (1H, dd, J=8.9, 1.1 Hz), 7.58 (1H, t, J=8.9Hz), 11.02 (1H, s).

Reference Example 132 Methyl3-[2,6-dimethyl-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-dimethylpropionate

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 1.28 (6H, s), 2.17-2.27 (1H,m), 2.22 (6H, s), 2.64 (1H, dd, J=16.7, 6.8 Hz), 3.30-3.40 (1H, m), 3.67(3H, s), 3.74 (2H, s), 7.44 (2H, s), 10.87 (1H, s).

Reference Example 133 Methyl3-[2-chloro-6-methyl-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-dimethylpropionate

¹H-NMR (CDCl₃) δ: 1.23 (3H, d, J=7.3 Hz), 1.38 (6H, s), 2.31 (3H, s),2.46 (1H, dd, J=16.8, 1.0 Hz), 2.68 (1H, dd, J=16.8, 6.8 Hz), 3.23-3.33(1H, m), 3.75 (3H, s), 3.95 (2H, s), 7.46 (1H, d, J=2.2 Hz), 7.59 (1H,d, J=2.2 Hz), 8.73 (1H, brs).

Reference Example 134 Methyl3-[2-fluoro-6-methyl-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-dimethylpropionate

¹H-NMR (CDCl₃) δ: 1.24 (3H, t, J=6.8 Hz), 1.34 (6H, s), 2.25 (3H, s),2.46 (1H, d, J=17.0 Hz), 2.69 (1H, dd, J=17.0, 6.8 Hz), 3.23-3.32 (1H,m), 3.72 (3H, s), 4.09-4.14 (2H, m), 7.28-7.36 (2H, m), 8.53 (1H, s).

Reference Example 135 Production of2,2-difluoro-3-[3-fluoro-2-methyl-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]propylmethanesulfonate

A suspension of6-(2-fluoro-4-hydroxy-3-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 92, 500 mg), 2,2-difluoro-3-(methylsulfonyloxy)propylmethanesulfonate (1.70 g), and cesium carbonate (2.07 g) in NMP (4 mL)was stirred at 150° C. under microwave irradiation for 1.5 hours. To thereaction mixture was added water, and the mixture was extracted withethyl acetate. The organic layer was washed with water and brine, driedover anhydrous sodium sulfate, and filtrated, and the solvent wasremoved. The obtained crude product was purified by silica gel columnchromatography (heptane:ethyl acetate=65:35 to 45:55) to afford thetitle compound as a pale yellow amorphous (324 mg).

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.3 Hz), 2.13 (3H, d, J=2.2 Hz), 2.24(1H, dd, J=16.7, 3.8 Hz), 2.67 (1H, dd, J=16.7, 6.7 Hz), 3.04-3.19 (1H,m), 3.32 (3H, s), 4.54 (2H, t, J=12.6 Hz), 4.73 (2H, t, J=13.4 Hz), 6.98(1H, d, J=8.8 Hz), 7.41 (1H, t, J=8.8 Hz), 10.96 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 135.

Reference Example 1363-[2,3-Difluoro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylmethanesulfonate

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 2.26 (1H, dd, J=16.9, 3.4Hz), 2.71 (1H, dd, J=16.9, 6.7 Hz), 3.13-3.22 (1H, m), 3.32 (3H, s),4.60-4.76 (4H, m), 7.16-7.26 (1H, m), 7.38-7.47 (1H, m), 11.06 (1H, s).

Reference Example 1373-[2,6-Dichloro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylmethanesulfonate

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 2.25 (1H, d, J=16.9 Hz),2.70 (1H, dd, J=16.9, 6.8 Hz), 3.34 (3H, s), 3.39-3.51 (1H, m), 4.49(2H, t, J=13.1 Hz), 4.76 (2H, t, J=13.6 Hz), 7.81-7.90 (2H, m), 11.12(1H, s).

Reference Example 1383-[2-Chloro-3-fluoro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylmethanesulfonate

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.1 Hz), 2.26 (1H, dd, J=16.9, 3.7Hz), 2.70 (1H, dd, J=16.9, 6.8 Hz), 3.07-3.21 (1H, m), 3.33 (3H, s),4.58-4.78 (4H, m), 7.17-7.25 (1H, m), 7.55-7.63 (1H, m), 11.06 (1H, s).

Reference Example 1393-[2-Chloro-6-fluoro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylmethanesulfonate

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.1 Hz), 2.25 (1H, d, J=17.0 Hz),2.70 (1H, dd, J=17.0, 7.0 Hz), 3.32 (3H, s), 3.37-3.49 (1H, m), 4.58(2H, t, J=13.1 Hz), 4.73 (2H, t, J=13.6 Hz), 7.65-7.75 (2H, m), 11.10(1H, s).

Reference Example 1403-[2-Bromo-3-fluoro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylmethanesulfonate

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.1 Hz), 2.26 (1H, dd, J=16.6, 3.8Hz), 2.70 (1H, dd, J=16.6, 6.8 Hz), 3.07-3.20 (1H, m), 3.36 (3H, s),4.55-4.81 (4H, m), 7.16 (1H, d, J=8.8 Hz), 7.62 (1H, t, J=8.8 Hz), 11.06(1H, s).

Reference Example 1412,2-Difluoro-3-[3-(methoxymethyloxy)-2-methyl-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]propylmethanesulfonate

¹H-NMR (CDCl₃) δ: 1.07 (3H, d, J=7.3 Hz), 2.22 (3H, s), 2.42 (1H, dd,J=17.1, 4.9 Hz), 2.79 (1H, dd, J=17.1, 7.0 Hz), 3.10 (3H, s), 3.25-3.37(1H, m), 3.51 (3H, s), 4.29 (2H, t, J=11.4 Hz), 4.61 (2H, t, J=11.8 Hz),4.89 (1H, d, J=5.9 Hz), 5.00 (1H, d, J=5.6 Hz), 6.67 (1H, d, J=8.5 Hz),7.16 (1H, d, J=8.5 Hz), 8.43 (1H, brs).

Reference Example 1422,2-Difluoro-3-[3-fluoro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)-2-vinylphenoxy]propylmethanesulfonate

¹H-NMR (CDCl₃) δ: 1.20 (3H, d, J=7.1 Hz), 2.43 (1H, dd, J=17.1, 3.7 Hz),2.70-2.80 (1H, m), 3.09 (3H, s), 3.21-3.32 (1H, m), 4.34 (2H, t, J=11.2Hz), 4.58 (2H, t, J=11.7 Hz), 5.59-5.65 (1H, m), 5.95-6.03 (1H, m),6.69-6.80 (2H, m), 7.43 (1H, t, J=8.5 Hz), 8.47 (1H, brs).

Reference Example 1433-[2-Chloro-6-methyl-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylmethanesulfonate

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.1 Hz), 2.24 (1H, d, J=16.9 Hz),2.34 (3H, s), 2.68 (1H, dd, J=16.9, 6.8 Hz), 3.30-3.45 (1H, m), 3.31(3H, s), 4.37 (2H, t, J=13.2 Hz), 4.75 (2H, t, J=13.6 Hz), 7.64 (1H, d,J=2.0 Hz), 7.70 (1H, d, J=2.0 Hz), 11.01 (1H, s).

Reference Example 144 Production of6-{4-[(Z)-4-(tert-butyldimethylsilyloxy)-2-butenyloxy]-3-chloro-2-fluorophenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

A mixture of6-(3-chloro-2-fluoro-4-hydroxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 89, 250 mg),(Z)-4-(tert-butyldimethylsilyloxy)-2-buten-1-ol (217 mg),bis(2-methoxyethyl) azodicarboxylate (251 mg), and triphenylphosphine(281 mg) in THF (10 mL) was stirred at room temperature overnight.Bis(2-methoxyethyl) azodicarboxylate (251 mg) and triphenylphosphine(281 mg) were added to the reaction mixture, and then the reactionmixture was stirred at room temperature for 4 hours. The solvent wasremoved, and the obtained crude product was purified by silica gelcolumn chromatography (heptane:ethyl acetate=65:35 to 45:55) to affordthe title compound as a white solid (296 mg).

¹H-NMR (CDCl₃) δ: 0.09 (6H, s), 0.92 (9H, s), 1.21 (3H, d, J=7.1 Hz),2.44 (1H, dd, J=17.1, 3.2 Hz), 2.74 (1H, dd, J=17.1, 6.7 Hz), 3.22-3.32(1H, m), 4.33 (2H, dd, J=5.3, 1.3 Hz), 4.81 (2H, dd, J=5.5, 1.1 Hz),5.65-5.86 (2H, m), 6.78 (1H, dd, J=8.8, 1.5 Hz), 7.45 (1H, t, J=8.8 Hz),8.47 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 144.

Reference Example 1456-{4-[(Z)-4-(tert-Butyldimethylsilyloxy)-2-butenyloxy]-3-chloro-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.06 (6H, s), 0.89 (9H, s), 1.24 (3H, d, J=7.6 Hz),2.34 (3H, s), 2.47 (1H, dd, J=17.1, 1.0 Hz), 2.70 (1H, dd, J=17.1, 6.8Hz), 3.24-3.33 (1H, m), 4.25-4.28 (2H, m), 4.57-4.61 (2H, m), 5.74-5.87(2H, m), 7.47-7.49 (1H, m), 7.61 (1H, d, J=2.2 Hz), 8.60 (1H, brs).

Reference Example 1466-{4-[(Z)-4-(tert-Butyldimethylsilyloxy)-2-butenyloxy]-2-fluoro-3-vinylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.09 (6H, s), 0.91 (9H, s), 1.19 (3H, d, J=7.3 Hz),2.42 (1H, dd, J=16.9 3.4 Hz), 2.73 (1H, dd, J=16.9, 6.6 Hz), 3.21-3.32(1H, m), 4.28-4.34 (2H, m), 4.71-4.77 (2H, m), 5.50-5.58 (1H, m),5.68-5.83 (2H, m), 6.04-6.09 (1H, m), 6.71 (1H, d, J=8.5 Hz), 6.80 (1H,dd, J=18.1, 12.2 Hz), 7.38 (1H, t, J=8.5 Hz), 8.52 (1H, brs).

Reference Example 1476-{4-[(Z)-4-(tert-Butyldimethylsilyloxy)-2-butenyloxy]-2-fluoro-3-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.09 (6H, s), 0.91 (9H, s), 1.20 (3H, d, J=7.1 Hz),2.15 (3H, d, J=2.2 Hz), 2.42 (1H, dd, J=17.0, 3.5 Hz), 2.73 (1H, dd,J=17.0, 6.7 Hz), 3.20-3.33 (1H, m), 4.28-4.34 (2H, m), 4.67-4.75 (2H,m), 5.66-5.83 (2H, m), 6.66 (1H, d, J=8.8 Hz), 7.34 (1H, t, J=8.8 Hz),8.43 (1H, s).

Reference Example 1486-{4-[(Z)-4-(tert-Butyldimethylsilyloxy)-2-butenyloxy]-2,3-difluorophenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.09 (6H, s), 0.91 (9H, s), 1.22 (3H, d, J=7.1 Hz),2.45 (1H, dd, J=17.0, 3.3 Hz), 2.74 (1H, dd, J=17.0, 6.7 Hz), 3.21-3.33(1H, m), 4.32 (2H, dd, J=5.4, 1.5 Hz), 4.80 (2H, dd, J=5.9, 1.2 Hz),5.66-5.75 (1H, m), 5.75-5.84 (1H, m), 6.75-6.84 (1H, m), 7.25-7.34 (1H,m), 8.51 (1H, brs).

Reference Example 1496-{4-[(Z)-4-(tert-Butyldimethylsilyloxy)-2-butenyloxy]-3-chloro-5-fluorophenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.06 (6H, s), 0.89 (9H, s), 1.24 (3H, d, J=7.6 Hz),2.49 (1H, dd, J=17.0, 0.7 Hz), 2.70 (1H, dd, J=17.0, 7.0 Hz), 3.18-3.31(1H, m), 4.26 (2H, d, J=3.9 Hz), 4.78 (2H, d, J=4.2 Hz), 5.73-5.83 (2H,m), 7.44 (1H, dd, J=12.0, 2.2 Hz), 7.54 (1H, t, J=2.2 Hz), 8.54 (1H, s).

Reference Example 1506-{3-Bromo-4-[(Z)-4-(tert-butyldimethylsilyloxy)-2-butenyloxy]-5-fluorophenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.06 (6H, s), 0.89 (9H, s), 1.24 (3H, d, J=7.3 Hz),2.48 (1H, dd, J=17.1, 1.5 Hz), 2.70 (1H, dd, J=17.1, 6.8 Hz), 3.18-3.31(1H, m), 4.27 (2H, d, J=4.6 Hz), 4.78 (2H, d, J=5.1 Hz), 5.73-5.83 (2H,m), 7.48 (1H, dd, J=12.1, 2.1 Hz), 7.70 (1H, t, J=2.1 Hz), 8.61 (1H,brs).

Reference Example 1516-{4-[3-(tert-Butyldimethylsilyloxy)propoxy]-3-chloro-2-hydroxyphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.04 (6H, s), 0.88 (9H, s), 1.30 (3H, d, J=7.3 Hz),2.04 (2H, quintet, J=6.1 Hz), 2.52 (1H, d, J=17.1 Hz), 2.74 (1H, dd,J=17.1, 6.6 Hz), 3.38-3.50 (1H, m), 3.85 (2H, t, J=6.1 Hz), 4.19 (2H, t,J=6.1 Hz), 6.56 (1H, d, J=8.8 Hz), 7.30 (1H, d, J=8.8 Hz), 8.47 (1H,brs), 12.38 (1H, s).

Reference Example 1526-{4-[3-(tert-Butyldimethylsilyloxy)propoxy]-2-hydroxy-3-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.04 (6H, s), 0.89 (9H, s), 1.29 (3H, d, J=7.3 Hz),2.01 (2H, quintet, J=6.1 Hz), 2.13 (3H, s), 2.46-2.54 (1H, m), 2.72 (1H,dd, J=16.8, 6.6 Hz), 3.40-3.52 (1H, m), 3.83 (2H, t, J=6.1 Hz), 4.11(2H, t, J=6.1 Hz), 6.48 (1H, d, J=8.8 Hz), 7.23-7.28 (1H, m), 8.37 (1H,brs), 11.89 (1H, s).

Reference Example 1536-{4-[3-(tert-Butyldimethylsilyloxy)propoxy]-2-fluoro-3-vinylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.04 (6H, s), 0.88 (9H, s), 1.19 (3H, d, J=7.1 Hz),2.03 (2H, quintet, J=6.1 Hz), 2.42 (1H, dd, J=16.9, 3.4 Hz), 2.73 (1H,dd, J=16.9, 6.6 Hz), 3.21-3.33 (1H, m), 3.82 (2H, t, J=6.1 Hz), 4.15(2H, t, J=6.1 Hz), 5.49-5.57 (1H, m), 5.99-6.08 (1H, m), 6.73 (1H, d,J=8.8 Hz), 6.80 (1H, dd, J=18.1, 12.2 Hz), 7.38 (1H, t, J=8.8 Hz), 8.53(1H, brs).

Reference Example 1546-{4-[4-(tert-Butyldimethylsilyloxy)butoxy]-3-chloro-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.06 (6H, s), 0.90 (9H, s), 1.24 (3H, d, J=7.3 Hz),1.70-1.80 (2H, m), 1.85-1.95 (2H, m), 2.33 (3H, s), 2.43-2.51 (1H, m),2.68 (1H, dd, J=16.9, 6.8 Hz), 3.23-3.34 (1H, m), 3.70 (2H, t, J=6.4Hz), 3.96 (2H, t, J=6.4 Hz), 7.47 (1H, dd, J=2.2, 0.7 Hz), 7.57-7.61(1H, m), 8.54 (1H, s).

Reference Example 1556-{3-Bromo-4-[4-(tert-butyldimethylsilyloxy)butoxy]-5-fluorophenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.06 (6H, s), 0.89 (9H, s), 1.24 (3H, d, J=7.3 Hz),1.69-1.79 (2H, m), 1.83-1.93 (2H, m), 2.48 (1H, dd, J=16.9, 1.0 Hz),2.70 (1H, dd, J=16.9, 6.8 Hz), 3.18-3.32 (1H, m), 3.69 (2H, t, J=6.2Hz), 4.19 (2H, td, J=6.5, 1.3 Hz), 7.48 (1H, dd, J=12.2, 2.2 Hz),7.67-7.72 (1H, m), 8.55 (1H, brs).

Reference Example 1566-{4-[4-(tert-Butyldimethylsilyloxy)butoxy]-3,5-dichlorophenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.06 (6H, s), 0.90 (9H, s), 1.25 (3H, d, J=7.3 Hz),1.71-1.82 (2H, m), 1.88-1.98 (2H, m), 2.49 (1H, d, J=16.9 Hz), 2.70 (1H,dd, J=16.9, 6.8 Hz), 3.19-3.33 (1H, m), 3.71 (2H, t, J=6.2 Hz), 4.08(2H, t, J=6.5 Hz), 7.68 (2H, s), 8.53 (1H, brs).

Reference Example 1576-{4-[4-(tert-Butyldimethylsilyloxy)butoxy]-2,3-difluorophenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.06 (6H, s), 0.90 (9H, s), 1.21 (3H, d, J=7.1 Hz),1.64-1.76 (2H, m), 1.86-1.96 (2H, m), 2.45 (1H, dd, J=17.0, 2.9 Hz),2.74 (1H, dd, J=17.0, 6.7 Hz), 3.20-3.34 (1H, m), 3.69 (2H, t, J=6.1Hz), 4.12 (2H, t, J=6.5 Hz), 6.74-6.81 (1H, m), 7.24-7.34 (1H, m), 8.55(1H, brs).

Reference Example 1586-{4-[4-(tert-Butyldimethylsilyloxy)butoxy]-2-fluoro-3-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.06 (6H, s), 0.90 (9H, s), 1.19 (3H, d, J=7.1 Hz),1.67-1.76 (2H, m), 1.82-1.94 (2H, m), 2.15 (3H, d, J=2.2 Hz), 2.42 (1H,dd, J=16.9, 3.5 Hz), 2.73 (1H, dd, J=16.9, 6.8 Hz), 3.22-3.33 (1H, m),3.69 (2H, t, J=6.2 Hz), 4.03 (2H, t, J=6.3 Hz), 6.65 (1H, d, J=8.8 Hz),7.34 (1H, t, J=8.8 Hz), 8.48 (1H, s).

Reference Example 1596-{4-[4-(tert-Butyldimethylsilyloxy)butoxy]-3-chloro-2-fluorophenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.06 (6H, s), 0.90 (9H, s), 1.21 (3H, d, J=7.3 Hz),1.68-1.78 (2H, m), 1.87-1.99 (2H, m), 2.44 (1H, dd, J=17.0, 3.3 Hz),2.74 (1H, dd, J=17.0, 6.7 Hz), 3.22-3.34 (1H, m), 3.70 (2H, t, J=6.2Hz), 4.12 (2H, t, J=6.5 Hz), 6.76 (1H, dd, J=8.8, 1.2 Hz), 7.45 (1H, t,J=8.8 Hz), 8.49 (1H, s).

Reference Example 1606-{4-[4-(tert-Butyldimethylsilyloxy)butoxy]-2-hydroxy-3-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.06 (6H, s), 0.90 (9H, s), 1.28 (3H, d, J=7.6 Hz),1.67-1.77 (2H, m), 1.83-1.94 (2H, m), 2.14 (3H, s), 2.49 (1H, d, J=17.1Hz), 2.72 (1H, dd, J=17.1, 6.6 Hz), 3.40-3.50 (1H, m), 3.69 (2H, t,J=6.4 Hz), 4.03 (2H, t, J=6.4 Hz), 6.46 (1H, d, J=9.0 Hz), 7.24 (1H, d,J=9.0 Hz), 8.48 (1H, brs), 11.90 (1H, s).

Reference Example 1616-{4-[4-(tert-Butyldimethylsilyloxy)butoxy]-3-chloro-2-hydroxyphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.06 (6H, s), 0.90 (9H, s), 1.29 (3H, d, J=7.6 Hz),1.68-1.78 (2H, m), 1.88-1.98 (2H, m), 2.49-2.55 (1H, m), 2.74 (1H, dd,J=17.1, 6.6 Hz), 3.38-3.48 (1H, m), 3.70 (2H, t, J=6.4 Hz), 4.11 (2H, t,J=6.4 Hz), 6.53 (1H, d, J=9.0 Hz), 7.29 (1H, d, J=9.0 Hz), 8.57 (1H,brs), 12.40 (1H, s).

Reference Example 1626-{4-[4-(tert-Butyldimethylsilyloxy)butoxy]-2-fluoro-3-vinylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.06 (6H, s), 0.90 (9H, s), 1.19 (3H, d, J=7.1 Hz),1.66-1.76 (2H, m), 1.86-1.97 (2H, m), 2.42 (1H, dd, J=16.9, 3.4 Hz),2.73 (1H, dd, J=16.9, 6.6 Hz), 3.21-3.32 (1H, m), 3.69 (2H, t, J=6.4Hz), 4.07 (2H, t, J=6.4 Hz), 5.49-5.57 (1H, m), 6.01-6.09 (1H, m), 6.70(1H, d, J=8.1 Hz), 6.81 (1H, dd, J=18.1, 12.0 Hz), 7.35-7.40 (1H, m),8.51 (1H, brs).

Reference Example 1636-{4-[4-(tert-Butyldimethylsilyloxy)butoxy]-3-ethyl-2-fluorophenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.06 (6H, s), 0.90 (9H, s), 1.14 (3H, t, J=7.3 Hz),1.19 (3H, d, J=7.3 Hz), 1.66-1.76 (2H, m), 1.82-1.94 (2H, m), 2.41 (1H,dd, J=17.1, 3.4 Hz), 2.64-2.78 (3H, m), 3.21-3.32 (1H, m), 3.69 (2H, t,J=6.4 Hz), 4.03 (2H, t, J=6.4 Hz), 6.66 (1H, d, J=8.5 Hz), 7.34 (1H, t,J=8.5 Hz), 8.48 (1H, brs).

Reference Example 1646-{4-[(E)-4-(tert-Butyldimethylsilyloxy)-2-butenyloxy]-3-chloro-2-fluorophenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.08 (6H, s), 0.92 (9H, s), 1.21 (3H, d, J=7.1 Hz),2.44 (1H, dd, J=17.0, 3.3 Hz), 2.74 (1H, dd, J=17.0, 6.7 Hz), 3.23-3.32(1H, m), 4.22-4.25 (2H, m), 4.66-4.69 (2H, m), 5.90-6.03 (2H, m), 6.77(1H, dd, J=8.8, 1.5 Hz), 7.45 (1H, t, J=8.8 Hz), 8.49 (1H, brs).

Reference Example 1656-{4-[5-(tert-Butyldimethylsilyloxy)pentoxy]-3-chloro-2-fluorophenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.05 (6H, s), 0.89 (9H, s), 1.20 (3H, d, J=7.3 Hz),1.50-1.65 (4H, m), 1.88 (2H, quintet, J=6.6 Hz), 2.43 (1H, dd, J=17.1,3.2 Hz), 2.73 (1H, dd, J=17.1, 6.8 Hz), 3.22-3.33 (1H, m), 3.65 (2H, t,J=6.1 Hz), 4.08 (2H, t, J=6.6 Hz), 6.75 (1H, dd, J=9.0, 1.5 Hz),7.42-7.49 (1H, m), 8.49 (1H, brs).

Reference Example 166 Production of2,2-difluoro-3-[3-fluoro-2-methyl-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]propylbenzoate

A mixture of2,2-difluoro-3-[3-fluoro-2-methyl-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]propylmethanesulfonate (Reference example 135, 324 mg) and sodium benzoate(229 mg) in DMF (4 mL) was stirred at 180° C. under microwaveirradiation for 30 minutes. To the reaction mixture was added water, andthe mixture was extracted with ethyl acetate. The organic layer waswashed with water and brine, dried over anhydrous sodium sulfate, andfiltrated, and the solvent was removed. The obtained crude product waspurified by silica gel column chromatography (heptane:ethylacetate=70:30 to 50:50) to afford the title compound as a white solid(253 mg).

¹H-NMR (DMSO-d6) δ: 1.02 (3H, d, J=7.1 Hz), 2.12 (3H, d, J=2.2 Hz), 2.23(1H, dd, J=16.7, 3.8 Hz), 2.67 (1H, dd, J=16.7, 6.8 Hz), 3.03-3.19 (1H,m), 4.63 (2H, t, J=12.7 Hz), 4.84 (2H, t, J=13.8 Hz), 7.01 (1H, d, J=8.8Hz), 7.40 (1H, t, J=8.8 Hz), 7.52-7.60 (2H, m), 7.67-7.75 (1H, m),7.98-8.05 (2H, m), 10.96 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 166.

Reference Example 1673-[2,3-Difluoro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylbenzoate

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.1 Hz), 2.25 (1H, dd, J=16.9, 3.4Hz), 2.71 (1H, dd, J=16.9, 6.8 Hz), 3.08-3.22 (1H, m), 4.67-4.87 (4H,m), 7.20-7.27 (1H, m), 7.37-7.46 (1H, m), 7.53-7.60 (2H, m), 7.68-7.74(1H, m), 7.98-8.05 (2H, m), 11.06 (1H, s).

Reference Example 1683-[2,6-Dichloro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylbenzoate

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.3 Hz), 2.24 (1H, d, J=16.9 Hz),2.69 (1H, dd, J=16.9, 6.8 Hz), 3.39-3.49 (1H, m), 4.56 (2H, t, J=12.8Hz), 4.86 (2H, t, J=13.6 Hz), 7.54-7.61 (2H, m), 7.68-7.76 (1H, m),7.83-7.88 (2H, m), 7.99-8.06 (2H, m), 11.12 (1H, s).

Reference Example 1693-[2-Chloro-3-fluoro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylbenzoate

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.3 Hz), 2.25 (1H, dd, J=16.9, 3.7Hz), 2.70 (1H, dd, J=16.9, 6.8 Hz), 3.06-3.21 (1H, m), 4.67-4.91 (4H,m), 7.20-7.28 (1H, m), 7.52-7.63 (3H, m), 7.67-7.74 (1H, m), 7.98-8.05(2H, m), 11.05 (1H, s).

Reference Example 1703-[2-Chloro-6-fluoro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylbenzoate

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.3 Hz), 2.24 (1H, d, J=16.7 Hz),2.69 (1H, dd, J=16.7, 7.0 Hz), 3.34-3.45 (1H, m), 4.67 (2H, t, J=12.9Hz), 4.83 (2H, t, J=13.7 Hz), 7.52-7.61 (2H, m), 7.64-7.75 (3H, m),7.98-8.04 (2H, m), 11.09 (1H, s).

Reference Example 1713-[2-Bromo-3-fluoro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylbenzoate

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.3 Hz), 2.25 (1H, dd, J=16.9, 3.9Hz), 2.70 (1H, dd, J=16.9, 6.8 Hz), 3.07-3.19 (1H, m), 4.75 (2H, t,J=12.6 Hz), 4.84 (2H, t, J=13.9 Hz), 7.19 (1H, dd, J=8.8, 1.2 Hz),7.53-7.64 (3H, m), 7.67-7.74 (1H, m), 7.98-8.04 (2H, m), 11.05 (1H, s).

Reference Example 1723-[2-Chloro-6-methyl-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylbenzoate

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 2.23 (1H, d, J=16.9 Hz),2.33 (3H, s), 2.68 (1H, dd, J=16.9, 6.8 Hz), 3.27-3.43 (1H, m), 4.45(2H, t, J=12.9 Hz), 4.85 (2H, t, J=13.6 Hz), 7.55-7.61 (2H, m),7.62-7.64 (1H, m), 7.67-7.69 (1H, m), 7.70-7.75 (1H, m), 8.00-8.07 (2H,m), 11.01 (1H, s).

Reference Example 1732,2-Difluoro-3-[3-fluoro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)-2-vinylphenoxy]propylbenzoate

¹H-NMR (CDCl₃) δ: 1.19 (3H, d, J=7.1 Hz), 2.43 (1H, dd, J=17.1, 3.7 Hz),2.70-2.80 (1H, m), 3.19-3.31 (1H, m), 4.39 (2H, t, J=11.2 Hz), 4.75 (2H,t, J=12.5 Hz), 5.55-5.62 (1H, m), 5.97-6.05 (1H, m), 6.70-6.81 (2H, m),7.37-7.49 (3H, m), 7.56-7.64 (1H, m), 8.00-8.06 (2H, m), 8.51 (1H, brs).

Reference Example 174 Production of(3R)-4-(3-chloro-4-hydroxy-5-methylphenyl)-3-methyl-N-[(1S)-1-(4-nitrophenyl)ethyl]-4-oxobutanamide

To a mixture of4-(3-chloro-4-hydroxy-5-methylphenyl)-3-methyl-4-oxobutanoic acid(Reference example 71, 317 mg) in DMF (10 mL) were added(S)-1-(4-nitrophenyl)ethylamine hydrochloride (275 mg), triethylamine(0.189 mL), 1-hydroxybenzotriazole monohydrate (208 mg), and1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (260 mg).The reaction mixture was stirred at room temperature for 3 days. To thereaction mixture was added saturated aqueous sodium bicarbonate, and themixture was extracted with ethyl acetate. The organic layer was washedwith water and brine, dried over anhydrous sodium sulfate, andfiltrated, and the solvent was removed. The obtained crude diastereomerwas purified by silica gel column chromatography (heptane:ethylacetate=67:33 to 25:75) to afford the title compound as a pale yellowamorphous (206 mg).

¹H-NMR (CDCl₃) δ: 1.18 (3H, d, J=7.1 Hz), 1.44 (3H, d, J=7.1 Hz),2.30-2.38 (4H, m), 2.80 (1H, dd, J=14.9, 9.0 Hz), 3.85-3.97 (1H, m),5.07 (1H, quintet, J=7.1 Hz), 5.99 (1H, d, J=6.8 Hz), 6.08 (1H, s),7.41-7.48 (2H, m), 7.70 (1H, d, J=1.5 Hz), 7.85 (1H, d, J=2.2 Hz),8.15-8.22 (2H, m).

Reference Example 175 Production of2-{2-chloro-6-methyl-4-[(2R)-2-methyl-3-{[(1S)-1-(4-nitrophenyl)ethyl]carbamoyl}propanoyl]phenoxy}ethyl4-bromobenzoate

To a mixture of(3R)-4-(3-chloro-4-hydroxy-5-methylphenyl)-3-methyl-N-[(1S)-1-(4-nitrophenyl)ethyl]-4-oxobutanamide(Reference example 174, 206 mg) in THF (5.0 mL) were added2-hydroxyethyl 4-bromobenzoate (162 mg) and triphenylphosphine (174 mg),and the mixture was cooled on ice bath. Bis(2-methoxyethyl)azodicarboxylate (155 mg) was slowly added to the reaction mixture, andthen the reaction mixture was stirred at room temperature overnight. Thesolvent was removed, and the obtained crude product was purified bysilica gel column chromatography (heptane:ethyl acetate=67:33 to 33:67)to afford the title compound as a colorless solid (205 mg).

¹H-NMR (CDCl₃) δ: 1.17 (3H, d, J=7.3 Hz), 1.45 (3H, d, J=7.1 Hz),2.31-2.39 (4H, m), 2.82 (1H, dd, J=14.9, 9.3 Hz), 3.85-3.96 (1H, m),4.32-4.38 (2H, m), 4.64-4.70 (2H, m), 5.08 (1H, quintet, J=7.1 Hz), 5.96(1H, d, J=7.1 Hz), 7.41-7.47 (2H, m), 7.57-7.63 (2H, m), 7.71 (1H, d,J=1.5 Hz), 7.85 (1H, d, J=2.2 Hz), 7.87-7.93 (2H, m), 8.15-8.21 (2H, m).

The obtained compound was recrystallized from ethyl acetate/heptane togive a single crystal thereof. According to the X-ray crystal structureanalysis of the single crystal, the stereochemistry at the 3rd positionof the butanamide moiety thereof was determined as R.

<Crystallographic Data>

Composition formula: C₂₉H₂₈BrClN₂O₇, Molecular weight: 631.90,monoclinic Space group P2₁(#4), a=4.7154(5)Å, b=20.026(2)Å,c=15.3231(18)Å, V=1433.7(3)Å³, Z=2, Dc=1.464 g/cm³, R-factor=0.1308

Reference Example 176 Production of3-bromo-2-fluoro-4-hydroxy-5-methylbenzaldehyde

To a solution of 2-fluoro-4-hydroxy-5-methylbenzaldehyde (3.39 g) inacetic acid (20 mL) was added pyridinium bromide perbromide (8.44 g),and the mixture was stirred at 75° C. for one hour. The reaction mixturewas allowed to cool to room temperature. To the reaction mixture wasadded water, and the precipitates were collected on a filter, washedwith water, and dried to afford the title compound as a pale brown solid(4.77 g).

¹H-NMR (DMSO-d6) δ: 2.25 (3H, s), 7.59 (1H, dd, J=8.1, 0.7 Hz), 10.02(1H, s), 10.82 (1H, brs).

The following compound was prepared from the appropriate startingmaterial in a similar manner to Reference example 28.

Reference Example 1772-Fluoro-4-(methoxymethyloxy)-3,5-dimethylbenzaldehyde

¹H-NMR (CDCl₃) δ: 2.25 (3H, d, J=2.3 Hz), 2.29 (3H, s), 3.62 (3H, s),5.03 (2H, s), 7.55 (1H, d, J=7.9 Hz), 10.27 (1H, s).

The following compound was prepared from the appropriate startingmaterial in a similar manner to Reference example 30.

Reference Example 178 3-Chloro-2,5-difluoro-4-methoxybenzaldehyde

¹H-NMR (CDCl₃) δ: 4.16 (3H, d, J=3.4 Hz), 7.53 (1H, dd, J=11.4, 6.3 Hz),10.23 (1H, d, J=3.2 Hz).

Reference Example 179 Production of5-chloro-2,4-dihydroxy-3-methylbenzaldehyde

To a mixture of 2,4-dihydroxy-3-methylbenzaldehyde (6.09 g) indichloroethane (80 mL) was added N-chlorosuccinimide (6.41 g), and themixture was stirred at 60° C. for 3 hours. The solvent was removed, andthe residue was dissolved in ethyl acetate. The solution was washed withwater and brine, dried over anhydrous sodium sulfate, filtrated, andthen concentrated. The obtained crude product was purified by silica gelcolumn chromatography (heptane:ethyl acetate=95:5 to 74:26) to affordthe title compound as a white solid (6.76 g).

¹H-NMR (DMSO-d6) δ: 2.07 (3H, d, J=0.6 Hz), 7.68-7.70 (1H, m), 9.77 (1H,s), 10.52 (1H, brs), 11.36 (1H, s).

Reference Example 180 Production of2,4-bis(benzyloxy)-5-chloro-3-methylbenzaldehyde

To a mixture of 5-chloro-2,4-dihydroxy-3-methylbenzaldehyde (Referenceexample 179, 6.76 g) in DMF (75 mL) were added potassium carbonate (15.0g) and benzyl bromide (10.8 mL), and the mixture was stirred at roomtemperature for one hour. To the reaction mixture was added water, andthe mixture was extracted with ethyl acetate. The organic layer waswashed with water and brine, dried over anhydrous sodium sulfate,filtrated, and concentrated. The obtained solid was washed bytrituration with diisopropyl ether, and then collected on a filter toafford the title compound as a pale brown solid (11.3 g).

¹H-NMR (DMSO-d6) δ: 2.20 (3H, d, J=0.5 Hz), 5.03 (2H, s), 5.05 (2H, s),7.35-7.55 (10H, m), 7.66-7.67 (1H, m), 9.99 (1H, s).

The following compound was prepared from the appropriate startingmaterial in a similar manner to Reference example 180.

Reference Example 181 2,4-Bis(benzyloxy)-3-chloro-5-methylbenzaldehyde

¹H-NMR (CDCl₃) δ: 2.25 (3H, d, J=0.7 Hz), 5.06 (2H, s), 5.14 (2H, s),7.35-7.53 (10H, m), 7.58 (1H, d, J=0.7 Hz), 10.05 (1H, s).

Reference Example 182 Production of4-benzyloxy-5-chloro-2-hydroxy-3-methylbenzaldehyde

To a mixture of 2,4-bis(benzyloxy)-5-chloro-3-methylbenzaldehyde(Reference example 180, 11.33 g) in toluene (140 mL)/diethyl ether (20mL) was added magnesium bromide (8.53 g). Under an argon atmosphere, themixture was stirred at 100° C. for one hour. The reaction mixture wasallowed to cool to room temperature, 1 M hydrochloric acid was addedthereto, and then the mixture was extracted with ethyl acetate. Theorganic layer was washed with brine, dried over anhydrous sodiumsulfate, filtrated, and then concentrated. The obtained crude productwas purified by silica gel column chromatography (heptane:ethylacetate=95:5 to 90:10 to 75:25) to afford the title compound as a whitesolid (4.26 g).

¹H-NMR (CDCl₃) δ: 2.15 (3H, d, J=0.5 Hz), 5.02 (2H, s), 7.34-7.53 (6H,m), 9.77 (1H, s), 11.37 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 182.

Reference Example 1834-Benzyloxy-3-chloro-2-hydroxy-5-methylbenzaldehyde

¹H-NMR (CDCl₃) δ: 2.21 (3H, d, J=0.9 Hz), 5.08 (2H, s), 7.29-7.31 (1H,m), 7.36-7.53 (5H, m), 9.79 (1H, s), 11.57 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 32.

Reference Example 184 2-Fluoro-4-(methoxymethyloxy)-5-methylbenzaldehyde

¹H-NMR (CDCl₃) δ: 2.22 (3H, s), 3.49 (3H, s), 5.26 (2H, s), 6.85 (1H, d,J=12.5 Hz), 7.65 (1H, dd, J=8.1, 0.7 Hz), 10.21 (1H, s).

Reference Example 1853-Bromo-2-fluoro-4-(methoxymethyloxy)-5-methylbenzaldehyde

¹H-NMR (CDCl₃) δ: 2.36-2.39 (3H, m), 3.66 (3H, s), 5.18 (2H, s), 7.67(1H, dd, J=7.7, 0.7 Hz), 10.26 (1H, s).

Reference Example 1864-Benzyloxy-3-chloro-2-(methoxymethyloxy)-5-methylbenzaldehyde

¹H-NMR (CDCl₃) δ: 2.26 (3H, d, J=0.7 Hz), 3.63 (3H, s), 5.03 (2H, s),5.20 (2H, s), 7.34-7.51 (5H, m), 7.62-7.63 (1H, m), 10.27 (1H, s).

Reference Example 1874-Benzyloxy-5-chloro-2-(methoxymethyloxy)-3-methylbenzaldehyde

¹H-NMR (CDCl₃) δ: 2.19 (3H, d, J=0.5 Hz), 3.58 (3H, s), 5.03 (2H, s),5.04 (2H, s), 7.34-7.50 (5H, m), 7.78-7.80 (1H, m), 10.20 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 41.

Reference Example 188 Methyl4-[2-fluoro-4-(methoxymethyloxy)-5-methylphenyl]-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.21 (3H, d, J=7.1 Hz), 2.20 (3H, s), 2.41 (1H, dd,J=16.7, 5.9 Hz), 2.94 (1H, ddd, J=16.7, 8.4, 1.8 Hz), 3.49 (3H, s), 3.65(3H, s), 3.73-3.84 (1H, m), 5.24 (2H, s), 6.83 (1H, d, J=13.2 Hz), 7.69(1H, d, J=8.5 Hz).

Reference Example 189 Methyl4-(3-chloro-2,5-difluoro-4-methoxyphenyl)-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.22 (3H, dd, J=7.2, 1.0 Hz), 2.45 (1H, dd, J=17.0,5.1 Hz), 2.97 (1H, ddd, J=17.0, 9.1, 1.9 Hz), 3.65 (3H, s), 3.69-3.80(1H, m), 4.12 (3H, d, J=3.1 Hz), 7.57 (1H, dd, J=12.1, 6.5 Hz).

Reference Example 190 Methyl4-[2-fluoro-4-(methoxymethyloxy)-3,5-dimethylphenyl]-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.21 (3H, d, J=7.1 Hz), 2.24 (3H, d, J=2.7 Hz), 2.27(3H, s), 2.42 (1H, dd, J=16.7, 5.7 Hz), 2.94 (1H, ddd, J=16.7, 8.4, 1.6Hz), 3.61 (3H, s), 3.65 (3H, s), 3.73-3.86 (1H, m), 5.00 (2H, s), 7.52(1H, d, J=8.5 Hz).

Reference Example 191 Methyl4-[4-benzyloxy-3-chloro-2-(methoxymethyloxy)-5-methylphenyl]-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.15 (3H, d, J=7.3 Hz), 2.25 (3H, d, J=0.6 Hz), 2.40(1H, dd, J=16.6, 6.1 Hz), 2.87 (1H, dd, J=16.6, 7.8 Hz), 3.57 (3H, s),3.68 (3H, s), 3.82-3.92 (1H, m), 5.00 (2H, s), 5.08 (1H, d, J=5.6 Hz),5.13 (1H, d, J=5.6 Hz), 7.32-7.33 (1H, m), 7.35-7.53 (5H, m).

Reference Example 192 Methyl4-[4-benzyloxy-5-chloro-2-(methoxymethyloxy)-3-methylphenyl]-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.14 (3H, d, J=7.2 Hz), 2.23 (3H, d, J=0.5 Hz), 2.39(1H, dd, J=16.7, 5.9 Hz), 2.87 (1H, dd, J=16.7, 8.1 Hz), 3.50 (3H, s),3.68 (3H, s), 3.76-3.87 (1H, m), 4.92 (1H, d, J=6.0 Hz), 4.99 (1H, d,J=6.0 Hz), 5.00 (2H, s), 7.34-7.52 (6H, m).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 63.

Reference Example 1934-(3-Chloro-2,5-difluoro-4-methoxyphenyl)-3-methyl-4-oxobutanoic acid

¹H-NMR (DMSO-d6) δ: 1.10 (3H, d, J=7.1 Hz), 2.43 (1H, dd, J=17.0, 5.1Hz), 2.71 (1H, ddd, J=17.0, 8.8, 1.2 Hz), 3.57-3.69 (1H, m), 4.08 (3H,d, J=2.9 Hz), 7.73 (1H, dd, J=12.2, 6.7 Hz), 12.25 (1H, s).

Reference Example 1944-[2-Fluoro-4-(methoxymethyloxy)-3,5-dimethylphenyl]-3-methyl-4-oxobutanoicacid

¹H-NMR (DMSO-d6) δ: 1.08 (3H, d, J=7.1 Hz), 2.19 (3H, d, J=2.4 Hz), 2.25(3H, s), 2.37 (1H, dd, J=16.9, 5.3 Hz), 2.69 (1H, ddd, J=16.9, 8.9, 1.3Hz), 3.52 (3H, s), 3.58-3.68 (1H, m), 5.04 (2H, s), 7.50 (1H, d, J=8.5Hz), 12.16 (1H, brs).

Reference Example 1954-[4-Benzyloxy-3-chloro-2-(methoxymethyloxy)-5-methylphenyl]-3-methyl-4-oxobutanoicacid

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 2.25 (3H, s), 2.34 (1H, dd,J=16.7, 6.0 Hz), 2.64 (1H, dd, J=16.7, 7.7 Hz), 3.45 (3H, s), 3.67-3.77(1H, m), 4.98-5.02 (3H, m), 5.04 (1H, d, J=5.9 Hz), 7.34-7.56 (6H, m),12.16 (1H, brs).

Reference Example 1964-[4-Benzyloxy-5-chloro-2-(methoxymethyloxy)-3-methylphenyl]-3-methyl-4-oxobutanoicacid

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.1 Hz), 2.20 (3H, d, J=0.5 Hz), 2.34(1H, dd, J=16.8, 5.9 Hz), 2.64 (1H, dd, J=16.8, 7.8 Hz), 3.40 (3H, s),3.64-3.74 (1H, m), 4.90 (1H, d, J=6.1 Hz), 4.95 (1H, d, J=6.1 Hz), 4.99(2H, s), 7.36-7.53 (5H, m), 7.55-7.56 (1H, m), 12.22 (1H, brs).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 73.

Reference Example 1976-(3-Chloro-2,5-difluoro-4-methoxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 2.26 (1H, dd, J=16.9, 3.7Hz), 2.71 (1H, dd, J=16.9, 6.8 Hz), 3.12-3.22 (1H, m), 4.00 (3H, d,J=2.1 Hz), 7.57 (1H, dd, J=12.3, 7.1 Hz), 11.14 (1H, s).

Reference Example 1986-[2-Fluoro-4-(methoxymethyloxy)-3,5-dimethylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.17 (3H, d, J=2.4 Hz),2.20-2.27 (1H, m), 2.23 (3H, s), 2.66 (1H, dd, J=16.7, 6.7 Hz),3.07-3.18 (1H, m), 3.52 (3H, s), 5.00 (2H, s), 7.26 (1H, d, J=8.8 Hz),10.98 (1H, s).

Reference Example 1996-[4-Benzyloxy-3-chloro-2-(methoxymethyloxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.94 (3H, d, J=7.2 Hz), 2.24 (3H, d, J=0.7 Hz), 2.26(1H, dd, J=16.7, 5.4 Hz), 2.67 (1H, dd, J=16.7, 7.0 Hz), 3.11-3.23 (1H,m), 3.46 (3H, s), 4.96 (2H, s), 5.01-5.06 (2H, m), 7.18-7.19 (1H, m),7.34-7.55 (5H, m), 10.96 (1H, s).

Reference Example 2006-[4-Benzyloxy-5-chloro-2-(methoxymethyloxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.94 (3H, d, J=7.2 Hz), 2.21 (3H, s), 2.26 (1H, dd,J=16.8, 5.8 Hz), 2.67 (1H, dd, J=16.8, 6.9 Hz), 3.10-3.20 (1H, m), 3.42(3H, s), 4.93 (1H, d, J=6.0 Hz), 4.95 (1H, d, J=6.0 Hz), 4.96 (2H, s),7.29-7.31 (1H, m), 7.35-7.54 (5H, m), 10.95 (1H, s).

Reference Example 2016-[2-Fluoro-4-(methoxymethyloxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 2.17 (3H, s), 2.22 (1H, dd,J=16.7, 3.3 Hz), 2.66 (1H, dd, J=16.7, 6.8 Hz), 3.10-3.18 (1H, m), 3.39(3H, s), 5.28 (2H, s), 6.95 (1H, d, J=13.4 Hz), 7.42 (1H, dd, J=9.0, 0.7Hz), 10.95 (1H, s).

The following compound was prepared from the appropriate startingmaterial in a similar manner to Reference example 92.

Reference Example 2026-(3-Chloro-2,5-difluoro-4-hydroxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 2.24 (1H, dd, J=16.8, 3.4Hz), 2.68 (1H, dd, J=16.8, 6.8 Hz), 3.10-3.21 (1H, m), 7.45 (1H, dd,J=11.7, 7.2 Hz), 11.05 (1H, s), 11.37 (1H, brs).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 98.

Reference Example 2036-[3-Chloro-4-hydroxy-2-(methoxymethyloxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.92 (3H, d, J=7.3 Hz), 2.18 (3H, d, J=0.7 Hz), 2.23(1H, dd, J=16.7, 5.1 Hz), 2.64 (1H, dd, J=16.7, 6.8 Hz), 3.12-3.22 (1H,m), 3.44 (3H, s), 4.96 (1H, d, J=5.7 Hz), 4.99 (1H, d, J=5.7 Hz),7.03-7.05 (1H, m), 9.50 (1H, brs), 10.86 (1H, s).

Reference Example 2046-[5-Chloro-4-hydroxy-2-(methoxymethyloxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.91 (3H, d, J=7.3 Hz), 2.16 (3H, s), 2.23 (1H, dd,J=16.8, 5.4 Hz), 2.64 (1H, dd, J=16.8, 7.0 Hz), 3.10-3.19 (1H, m), 3.41(3H, s), 4.89 (1H, d, J=6.0 Hz), 4.91 (1H, d, J=6.0 Hz), 7.13-7.15 (1H,m), 9.54 (1H, s), 10.85 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 103.

Reference Example 2056-(2-Fluoro-4-hydroxy-5-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.1 Hz), 2.09 (3H, s), 2.20 (1H, dd,J=16.7, 3.1 Hz), 2.64 (1H, dd, J=16.7, 6.7 Hz), 3.08-3.16 (1H, m), 6.59(1H, d, J=13.2 Hz), 7.32 (1H, dd, J=9.3, 0.7 Hz), 10.19 (1H, brs), 10.87(1H, s).

Reference Example 2066-(2-Fluoro-4-hydroxy-3,5-dimethylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.2 Hz), 2.10 (3H, d, J=2.2 Hz), 2.15(3H, s), 2.20 (1H, dd, J=16.7, 3.4 Hz), 2.63 (1H, dd, J=16.7, 6.7 Hz),3.05-3.16 (1H, m), 7.14 (1H, d, J=9.0 Hz), 9.03 (1H, s), 10.87 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 107.

Reference Example 2076-[5-Chloro-2-fluoro-3-methyl-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.18 (3H, s), 2.21-2.29 (4H,m), 2.69 (1H, dd, J=16.8, 6.8 Hz), 3.07-3.17 (1H, m), 4.72 (2H, s), 7.53(1H, d, J=7.8 Hz), 11.07 (1H, s).

Reference Example 2086-[3-Chloro-2-fluoro-5-methyl-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.19 (3H, s), 2.22-2.30 (1H,m), 2.28 (3H, s), 2.70 (1H, dd, J=16.8, 6.8 Hz), 3.09-3.19 (1H, m), 4.73(2H, s), 7.44 (1H, d, J=8.4 Hz), 11.08 (1H, s).

Reference Example 2096-[3-Chloro-2,5-difluoro-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 2.16 (3H, s), 2.26 (1H, dd,J=16.8, 3.5 Hz), 2.70 (1H, dd, J=16.8, 6.8 Hz), 3.12-3.21 (1H, m),5.02-5.07 (2H, m), 7.53 (1H, dd, J=13.0, 7.1 Hz), 11.13 (1H, s).

Reference Example 2106-[3-Chloro-2-(methoxymethyloxy)-5-methyl-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.93 (3H, d, J=7.3 Hz), 2.19 (3H, s), 2.25 (1H, dd,J=16.8, 5.6 Hz), 2.26 (3H, d, J=0.7 Hz), 2.66 (1H, dd, J=16.8, 6.9 Hz),3.10-3.20 (1H, m), 3.45 (3H, s), 4.66 (2H, s), 5.01 (1H, d, J=5.9 Hz),5.02 (1H, d, J=5.9 Hz), 7.17-7.18 (1H, m), 10.95 (1H, s).

Reference Example 2116-[3-Chloro-2-(methoxymethyloxy)-4-(2-oxobutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.07 (3H, d, J=7.3 Hz), 1.14 (3H, t, J=7.3 Hz), 2.41(1H, dd, J=16.9, 4.6 Hz), 2.69-2.85 (3H, m), 3.30-3.40 (1H, m), 3.54(3H, s), 4.63 (2H, s), 5.04 (1H, d, J=5.6 Hz), 5.18 (1H, d, J=5.6 Hz),6.63 (1H, d, J=8.8 Hz), 7.21 (1H, d, J=8.8 Hz), 8.52 (1H, brs).

Reference Example 212 Production of6-[3-chloro-4-(2-hydroxy-2-methylpropoxy)-2-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

A mixture of6-[3-chloro-4-hydroxy-2-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 99, 130 mg), 1-chloro-2-methyl-2-propanol (0.268 mL),and potassium carbonate (241 mg) in ethanol (2.0 mL)/water (0.2 mL) wasstirred at 80° C. for 7 hours. The reaction mixture was poured intoaqueous sodium hydroxide, and the mixture was extracted with ethylacetate. The organic layer was washed with water and brine, dried overanhydrous sodium sulfate, and filtrated. The solvent was removed toafford the title compound as a colorless oil (130 mg).

¹H-NMR (CDCl₃) δ: 1.07 (3H, d, J=7.3 Hz), 1.39 (6H, s), 2.42 (1H, dd,J=17.0, 4.8 Hz), 2.80 (1H, dd, J=17.0, 7.0 Hz), 3.30-3.41 (1H, m), 3.53(3H, s), 3.87 (2H, s), 5.01-5.06 (1H, m), 5.14-5.20 (1H, m), 6.76 (1H,d, J=8.5 Hz), 7.22 (1H, d, J=8.5 Hz), 8.44 (1H, brs).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 212.

Reference Example 2136-[3-Chloro-4-(2-hydroxy-2-methylpropoxy)-2-(methoxymethyloxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.93 (3H, d, J=7.3 Hz), 1.28 (6H, s), 2.21-2.29 (1H,m), 2.27 (3H, d, J=0.7 Hz), 2.66 (1H, dd, J=16.8, 6.9 Hz), 3.10-3.20(1H, m), 3.45 (3H, s), 3.64 (2H, s), 4.64 (1H, s), 5.00 (1H, d, J=5.8Hz), 5.02 (1H, d, J=5.8 Hz), 7.15-7.16 (1H, m), 10.94 (1H, s).

Reference Example 2146-[4-(2-Hydroxy-2-methylpropoxy)-2-(methoxymethyloxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.07 (3H, d, J=7.3 Hz), 1.38 (6H, s), 2.16 (1H, s),2.24 (3H, s), 2.41 (1H, dd, J=17.1, 4.6 Hz), 2.79 (1H, dd, J=17.1, 6.8Hz), 3.28-3.38 (1H, m), 3.51 (3H, s), 3.82 (2H, s), 4.89 (1H, d, J=5.6Hz), 5.00 (1H, d, J=5.6 Hz), 6.67 (1H, d, J=8.5 Hz), 7.14 (1H, d, J=8.5Hz), 8.46 (1H, brs).

Reference Example 2156-[5-Chloro-4-(2-hydroxy-2-methylpropoxy)-2-(methoxymethyloxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.93 (3H, d, J=7.3 Hz), 1.28 (6H, s), 2.251 (1H, dd,J=16.8, 5.8 Hz), 2.255 (3H, d, J=0.6 Hz), 2.66 (1H, dd, J=16.8, 6.9 Hz),3.09-3.20 (1H, m), 3.42 (3H, s), 3.64 (2H, s), 4.66 (1H, s), 4.92 (1H,d, J=6.0 Hz), 4.96 (1H, d, J=6.0 Hz), 7.24-7.25 (1H, m), 10.94 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 135.

Reference Example 2163-[6-Chloro-3-fluoro-2-methyl-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylmethanesulfonate

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.22-2.30 (4H, m), 2.69 (1H,dd, J=16.8, 6.8 Hz), 3.09-3.18 (1H, m), 3.34 (3H, s), 4.43 (2H, t,J=13.3 Hz), 4.75 (2H, t, J=13.5 Hz), 7.57 (1H, d, J=7.8 Hz), 11.09 (1H,s).

Reference Example 2173-[2-Chloro-3-fluoro-6-methyl-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylmethanesulfonate

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 2.26 (1H, dd, J=16.8, 3.8Hz), 2.30 (3H, s), 2.70 (1H, dd, J=16.8, 6.8 Hz), 3.10-3.20 (1H, m),3.34 (3H, s), 4.44 (2H, t, J=13.2 Hz), 4.75 (2H, t, J=13.5 Hz), 7.48(1H, d, J=8.2 Hz), 11.10 (1H, s).

Reference Example 2182,2-Difluoro-3-[3-fluoro-2,6-dimethyl-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]propylmethanesulfonate

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.19 (3H, d, J=2.3 Hz), 2.24(1H, dd, J=16.8, 3.8 Hz), 2.25 (3H, s), 2.67 (1H, dd, J=16.8, 6.8 Hz),3.06-3.17 (1H, m), 3.31 (3H, s), 4.27 (2H, t, J=13.2 Hz), 4.74 (2H, t,J=13.6 Hz), 7.28 (1H, d, J=8.8 Hz), 11.00 (1H, s).

Reference Example 2193-[2-Chloro-3,6-difluoro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylmethanesulfonate

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 2.27 (1H, dd, J=16.9, 3.8Hz), 2.71 (1H, dd, J=16.9, 6.8 Hz), 3.13-3.22 (1H, m), 3.31 (3H, s),4.60-4.78 (4H, m), 7.63 (1H, dd, J=12.0, 7.0 Hz), 11.17 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 144.

Reference Example 2206-(4-{[(1S*,2R*)-2-(tert-Butyldimethylsilyloxymethyl)cyclopropyl]methoxy}-3-chloro-2-fluorophenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.04 (3H, s), 0.05 (3H, s), 0.49 (1H, d, J=5.6 Hz),0.85-0.95 (10H, m), 1.21 (3H, d, J=7.1 Hz), 1.25-1.37 (1H, m), 1.38-1.49(1H, m), 2.44 (1H, dd, J=17.1, 3.2 Hz), 2.74 (1H, dd, J=17.1, 6.7 Hz),3.22-3.33 (1H, m), 3.65-3.73 (1H, m), 3.81-3.88 (1H, m), 4.13-4.23 (2H,m), 6.73-6.79 (1H, m), 7.42-7.49 (1H, m), 8.53 (1H, s).

Reference Example 2216-(4-{[(1S*,2R*)-2-(tert-Butyldimethylsilyloxymethyl)cyclopropyl]methoxy}-3-chloro-5-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.046 (3H, s), 0.054 (3H, s), 0.38-0.45 (1H, m),0.87-0.94 (10H, m), 1.22-1.34 (4H, m), 1.39-1.51 (1H, m), 2.36 (3H, s),2.43-2.51 (1H, m), 2.69 (1H, dd, J=17.1, 6.8 Hz), 3.23-3.34 (1H, m),3.71 (2H, d, J=7.1 Hz), 3.94 (1H, dd, J=10.4, 7.9 Hz), 4.12 (1H, dd,J=10.4, 7.4 Hz), 7.48 (1H, d, J=2.2 Hz), 7.60 (1H, d, J=2.2 Hz), 8.54(1H, brs).

Reference Example 2226-(4-{[(1S*,2S*)-2-(tert-Butyldimethylsilyloxymethyl)cyclopropyl]methoxy}-3-chloro-2-fluorophenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.06 (6H, s), 0.58-0.70 (2H, m), 0.89 (9H, s),1.08-1.17 (1H, m), 1.18-1.29 (4H, m), 2.44 (1H, dd, J=17.0, 3.3 Hz),2.74 (1H, dd, J=17.0, 6.7 Hz), 3.22-3.33 (1H, m), 3.52-3.66 (2H, m),3.91-4.07 (2H, m), 6.71-6.79 (1H, m), 7.44 (1H, t, J=8.5 Hz), 8.51 (1H,brs).

Reference Example 2236-{4-[(Z)-4-(tert-Butyldimethylsilyloxy)-2-butenyloxy]-2-fluoro-3,5-dimethylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.06 (6H, s), 0.89 (9H, s), 1.20 (3H, d, J=7.2 Hz),2.22 (3H, d, J=2.4 Hz), 2.26 (3H, s), 2.43 (1H, dd, J=17.0, 3.4 Hz),2.74 (1H, dd, J=17.0, 6.7 Hz), 3.22-3.32 (1H, m), 4.21-4.28 (2H, m),4.42 (2H, d, J=5.3 Hz), 5.72-5.86 (2H, m), 7.21 (1H, d, J=8.8 Hz), 8.47(1H, brs).

Reference Example 2246-{4-[(Z)-4-(tert-Butyldimethylsilyloxy)-2-butenyloxy]-3-chloro-2-fluoro-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.06 (6H, s), 0.89 (9H, s), 1.21 (3H, dd, J=7.2, 0.6Hz), 2.27-2.30 (3H, m), 2.45 (1H, dd, J=17.0, 3.4 Hz), 2.74 (1H, dd,J=17.0, 6.7 Hz), 3.22-3.31 (1H, m), 4.25-4.28 (2H, m), 4.59-4.63 (2H,m), 5.74-5.87 (2H, m), 7.31 (1H, dd, J=8.3, 0.7 Hz), 8.52 (1H, s).

Reference Example 2256-{4-[(Z)-4-(tert-Butyldimethylsilyloxy)-2-butenyloxy]-3-chloro-2,5-difluorophenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.06 (6H, s), 0.89 (9H, s), 1.22 (3H, d, J=7.2 Hz),2.46 (1H, dd, J=17.0, 3.1 Hz), 2.73 (1H, dd, J=17.0, 6.8 Hz), 3.25-3.34(1H, m), 4.25-4.29 (2H, m), 4.82-4.86 (2H, m), 5.71-5.84 (2H, m), 7.34(1H, dd, J=11.7, 7.0 Hz), 8.55 (1H, s).

Reference Example 2266-{4-[(Z)-4-(tert-Butyldimethylsilyloxy)-2-butenyloxy]-2-hydroxy-3-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.09 (6H, s), 0.92 (9H, s), 1.29 (3H, d, J=7.3 Hz),2.14 (3H, s), 2.47-2.53 (1H, m), 2.73 (1H, dd, J=16.9, 6.6 Hz),3.40-3.51 (1H, m), 4.30-4.35 (2H, m), 4.67-4.71 (2H, m), 5.69-5.80 (2H,m), 6.46 (1H, d, J=8.8 Hz), 7.21-7.28 (1H, m), 8.38 (1H, s), 11.90 (1H,s).

Reference Example 2276-{4-[(Z)-4-(tert-Butyldimethylsilyloxy)-2-butenyloxy]-3-chloro-2-hydroxyphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 0.12 (6H, s), 0.95 (9H, s), 1.33 (3H, d, J=7.6 Hz),2.52-2.59 (1H, m), 2.78 (1H, dd, J=17.1, 6.6 Hz), 3.41-3.53 (1H, m),4.34-4.40 (2H, m), 4.80-4.86 (2H, m), 5.72-5.86 (2H, m), 6.58 (1H, d,J=9.3 Hz), 7.32 (1H, d, J=9.3 Hz), 8.40-8.53 (1H, m), 12.41 (1H, d,J=2.4 Hz).

Reference Example 228 Production of6-[4-(3-hydroxypropoxy)-2-(methoxymethyloxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of6-[4-hydroxy-2-(methoxymethyloxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 98, 611 mg),3-(tert-butyldimethylsilyloxy)propan-1-ol (627 mg), andtriphenylphosphine (864 mg) in THF (12 mL) was added bis(2-methoxyethyl)azodicarboxylate (771 mg) at 0° C., and then the mixture was stirred atroom temperature overnight. The solvent was removed, and then theresidue was purified by silica gel column chromatography (heptane:ethylacetate=85:15 to 35:65) to afford a pale yellow oil (1.04 g). The oilwas dissolved in THF (10 mL), tetrabutylammonium fluoride (1.0 M THFsolution, 2.76 mL) was added to the mixture at 0° C., and then themixture was stirred at room temperature for 2.5 hours. The reactionmixture was concentrated, water was added to the residue, and then themixture was extracted with ethyl acetate. The organic layer was washedwith brine, dried over anhydrous sodium sulfate, and filtrated, and thesolvent was removed. The obtained crude product was purified by silicagel column chromatography (heptane:ethyl acetate=50:50 to 0:100) toafford the title compound as a colorless amorphous (635 mg).

¹H-NMR (CDCl₃) δ: 1.06 (3H, d, J=7.3 Hz), 1.77-1.85 (1H, m), 2.09 (2H,quintet, J=6.0 Hz), 2.19 (3H, s), 2.41 (1H, dd, J=17.1, 4.6 Hz), 2.78(1H, dd, J=17.1, 7.0 Hz), 3.28-3.37 (1H, m), 3.50 (3H, s), 3.87-3.91(2H, m), 4.15 (2H, t, J=6.0 Hz), 4.88 (1H, d, J=5.6 Hz), 4.98 (1H, d,J=5.6 Hz), 6.70 (1H, d, J=8.5 Hz), 7.14 (1H, d, J=8.5 Hz), 8.56 (1H,brs).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 228.

Reference Example 2296-[3-Chloro-4-[(Z)-4-hydroxy-2-butenyloxy]-2-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.07 (3H, d, J=7.3 Hz), 1.63-1.68 (1H, m), 2.42 (1H,dd, J=17.0, 4.8 Hz), 2.80 (1H, dd, J=17.0, 7.0 Hz), 3.31-3.40 (1H, m),3.53 (3H, s), 4.29-4.35 (2H, m), 4.72-4.77 (2H, m), 5.02 (1H, d, J=5.6Hz), 5.16 (1H, d, J=5.6 Hz), 5.83-5.96 (2H, m), 6.78 (1H, d, J=8.5 Hz),7.22 (1H, d, J=8.5 Hz), 8.52 (1H, s).

Reference Example 2306-[3-Chloro-4-(4-hydroxybutoxy)-2-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.07 (3H, d, J=7.3 Hz), 1.50-1.54 (1H, m), 1.77-1.85(2H, m), 1.94-2.01 (2H, m), 2.42 (1H, dd, J=17.0, 4.8 Hz), 2.80 (1H, dd,J=17.0, 7.0 Hz), 3.32-3.40 (1H, m), 3.53 (3H, s), 3.74-3.79 (2H, m),4.11 (2H, t, J=6.1 Hz), 5.01 (1H, d, J=5.6 Hz), 5.16 (1H, d, J=5.6 Hz),6.77 (1H, d, J=8.8 Hz), 7.21 (1H, d, J=8.8 Hz), 8.45 (1H, brs).

Reference Example 2316-[3-Chloro-4-(3-hydroxypropoxy)-2-(methoxymethyloxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.08 (3H, d, J=7.6 Hz), 1.90 (1H, t, J=5.5 Hz),2.07-2.13 (2H, m), 2.30 (3H, d, J=0.7 Hz), 2.42 (1H, dd, J=17.0, 4.9Hz), 2.80 (1H, dd, J=17.0, 7.0 Hz), 3.30-3.39 (1H, m), 3.52 (3H, s),3.97 (2H, td, J=5.9, 5.5 Hz), 4.09 (2H, t, J=5.9 Hz), 4.98 (1H, d, J=5.4Hz), 5.12 (1H, d, J=5.4 Hz), 7.08 (1H, d, J=0.7 Hz), 8.49 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Reference example 166.

Reference Example 2323-[6-Chloro-3-fluoro-2-methyl-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylbenzoate

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.2 Hz), 2.20-2.30 (1H, m), 2.24 (3H,d, J=2.4 Hz), 2.69 (1H, dd, J=16.7, 6.7 Hz), 3.07-3.18 (1H, m), 4.51(2H, t, J=13.2 Hz), 4.85 (2H, t, J=13.6 Hz), 7.52-7.62 (3H, m),7.70-7.75 (1H, m), 8.00-8.07 (2H, m), 11.09 (1H, s).

Reference Example 2333-[2-Chloro-3-fluoro-6-methyl-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylbenzoate

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.1 Hz), 2.26 (1H, dd, J=16.8, 3.7Hz), 2.30 (3H, s), 2.70 (1H, dd, J=16.8, 6.8 Hz), 3.09-3.19 (1H, m),4.52 (2H, t, J=13.1 Hz), 4.85 (2H, t, J=13.6 Hz), 7.47 (1H, d, J=7.9Hz), 7.55-7.62 (2H, m), 7.69-7.76 (1H, m), 8.01-8.07 (2H, m), 11.10 (1H,s).

Reference Example 2342,2-Difluoro-3-[3-fluoro-2,6-dimethyl-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]propylbenzoate

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.2 Hz), 2.18 (3H, d, J=2.2 Hz), 2.23(3H, s), 2.24 (1H, dd, J=16.7, 3.9 Hz), 2.66 (1H, dd, J=16.7, 6.8 Hz),3.06-3.16 (1H, m), 4.36 (2H, t, J=13.2 Hz), 4.84 (2H, t, J=13.7 Hz),7.27 (1H, d, J=8.9 Hz), 7.54-7.62 (2H, m), 7.69-7.75 (1H, m), 8.02-8.08(2H, m), 11.00 (1H, s).

Reference Example 2353-[2-Chloro-3,6-difluoro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylbenzoate

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.27 (1H, dd, J=16.8, 3.6Hz), 2.71 (1H, dd, J=16.8, 6.9 Hz), 3.11-3.21 (1H, m), 4.75 (2H, t,J=13.0 Hz), 4.83 (2H, t, J=13.7 Hz), 7.52-7.65 (3H, m), 7.68-7.75 (1H,m), 7.97-8.05 (2H, m), 11.17 (1H, s).

Reference Example 236 Production of3-[2-chloro-3-hydroxy-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-difluoropropylbenzoate

A suspension of6-[3-chloro-4-hydroxy-2-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 99, 350 mg), 2,2-difluoro-3-(methylsulfonyloxy)propylmethanesulfonate (943 mg), and cesium carbonate (1.53 g) in NMP (2.0 mL)was stirred at 150° C. under microwave irradiation for 30 minutes. Tothe reaction mixture was added water, and the mixture was extracted withethyl acetate. The organic layer was washed with water and brine, driedover anhydrous sodium sulfate, and filtrated, and the solvent wasremoved. The residue was purified by silica gel column chromatography(heptane:ethyl acetate=50:50 to 0:100) to afford a mixture containingthe desired intermediate. A solution of the obtained mixture and sodiumbenzoate (121 mg) in NMP (2.0 mL) was stirred at 180° C. under microwaveirradiation for 30 minutes. To the reaction mixture was added water, andthe mixture was extracted with ethyl acetate. The organic layer waswashed with water and brine, dried over anhydrous sodium sulfate, andfiltrated, and the solvent was removed. The obtained crude product waspurified by silica gel column chromatography (heptane:ethylacetate=67:33 to 33:67) and then by diol silica gel columnchromatography (heptane:ethyl acetate=75:25 to 33:67) to afford thetitle compound as a colorless solid (38 mg).

¹H-NMR (CDCl₃) δ: 1.28 (3H, d, J=7.3 Hz), 2.53 (1H, d, J=16.6 Hz), 2.75(1H, dd, J=16.6, 6.6 Hz), 3.38-3.43 (1H, m), 4.42 (2H, t, J=11.2 Hz),4.48 (2H, t, J=12.7 Hz), 6.55 (1H, d, J=9.3 Hz), 7.31 (1H, d, J=9.3 Hz),7.41-7.48 (2H, m), 7.55-7.63 (1H, m), 8.00-8.06 (2H, m), 9.10 (1H, s),12.54 (1H, s).

Reference Example 237 Production of4-benzyloxy-1-bromo-2-fluoro-3-(trifluoromethyl)benzene

Under an argon atmosphere, to a mixture of4-benzyloxy-1-bromo-2-fluorobenzene (6.10 g) in THF (20 mL) was addeddropwise lithium diisopropylamide (2.0 M, a mixed solution ofTHF/heptane/ethylbenzene, 13.6 mL) at −78° C. The reaction mixture wasstirred at the same temperature for 30 minutes, and then iodine (6.61 g)was added thereto. The reaction mixture was stirred at −78° C. for 1.5hours. To the reaction mixture was added water, and the mixture wasextracted with ethyl acetate. The organic layer was washed with aqueoussodium thiosulfate, saturated aqueous sodium bicarbonate, and thenbrine, dried over anhydrous sodium sulfate, filtrated, and thenconcentrated. The residue was purified by silica gel columnchromatography (heptane:ethyl acetate=100:0 to 95:5 to 91:9), and thenthe obtained solid was washed by trituration with heptane to afford awhite solid (5.12 g). The white solid (5.12 g) was dissolved in NMP (40mL), and then methyl difluoro(fluorosulfonyl)acetate (12.8 mL) andcopper iodide (4.79 g) were added thereto. Under an argon atmosphere,the mixture was stirred at 100° C. for 18 hours. The reaction mixturewas allowed to cool to room temperature, water and ethyl acetate wereadded thereto, and then the mixture was filtered through a Celite pad.The separated organic layer was washed with water and brine, dried overanhydrous sodium sulfate, filtrated, and then concentrated. The obtainedcrude product was purified by silica gel column chromatography(heptane:ethyl acetate=100:0 to 83:17) to afford the title compound as awhite solid (3.93 g).

¹H-NMR (CDCl₃) δ: 5.17 (2H, s), 6.74 (1H, d, J=8.8 Hz), 7.31-7.43 (5H,m), 7.57-7.63 (1H, m).

The following compound was prepared from the appropriate startingmaterial in a similar manner to Reference example 20.

Reference Example 2384-Benzyloxy-2-fluoro-3-(trifluoromethyl)benzaldehyde

¹H-NMR (CDCl₃) δ: 5.28 (2H, s), 6.95 (1H, d, J=8.8 Hz), 7.32-7.45 (5H,m), 8.01 (1H, dd, J=8.8, 7.9 Hz), 10.25 (1H, s).

The following compound was prepared from the appropriate startingmaterial in a similar manner to Reference example 41.

Reference Example 239 Methyl4-[4-benzyloxy-2-fluoro-3-(trifluoromethyl)phenyl]-3-methyl-4-oxobutanoate

¹H-NMR (CDCl₃) δ: 1.22 (3H, dd, J=7.0, 0.9 Hz), 2.44 (1H, dd, J=16.8,5.2 Hz), 2.95 (1H, ddd, J=16.8, 8.9, 1.8 Hz), 3.64 (3H, s), 3.69-3.79(1H, m), 5.25 (2H, s), 6.91 (1H, d, J=9.0 Hz), 7.31-7.44 (5H, m),7.96-8.03 (1H, m).

The following compound was prepared from the appropriate startingmaterial in a similar manner to Reference example 63.

Reference Example 2404-[4-Benzyloxy-2-fluoro-3-(trifluoromethyl)phenyl]-3-methyl-4-oxobutanoicacid

¹H-NMR (DMSO-d6) δ: 1.10 (3H, d, J=7.1 Hz), 2.41 (1H, dd, J=17.0, 5.3Hz), 2.71 (1H, ddd, J=17.0, 9.0, 0.9 Hz), 3.55-3.67 (1H, m), 5.39 (2H,s), 7.32-7.49 (6H, m), 8.05-8.13 (1H, m), 12.20 (1H, s).

The following compound was prepared from the appropriate startingmaterial in a similar manner to Reference example 83.

Reference Example 2416-[4-Benzyloxy-2-fluoro-3-(trifluoromethyl)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.25 (1H, dd, J=16.7, 4.2Hz), 2.69 (1H, dd, J=16.7, 6.7 Hz), 3.05-3.19 (1H, m), 5.34 (2H, s),7.28 (1H, d, J=9.2 Hz), 7.32-7.50 (5H, m), 7.77-7.87 (1H, m), 11.05 (1H,s).

The following compound was prepared from the appropriate startingmaterial in a similar manner to Reference example 98.

Reference Example 2426-[2-Fluoro-4-hydroxy-3-(trifluoromethyl)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.23 (1H, dd, J=16.8, 3.8Hz), 2.67 (1H, dd, J=16.8, 6.8 Hz), 3.04-3.15 (1H, m), 6.90 (1H, d,J=8.8 Hz), 7.61-7.68 (1H, m), 10.99 (1H, s), 11.40 (1H, brs).

Example 1 Production of6-[3-bromo-5-chloro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To the mixture of6-(3-Bromo-5-chloro-4-hydroxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 87, 300 mg) was dissolved in ethanol-water (4:1, 10mL) were added 1-chloro-2-methyl-2-propanol (0.388 mL) and potassiumcarbonate (522 mg). The reaction mixture was refluxed for 8 hours. Tothe reaction mixture was added water, and the mixture was extracted withethyl acetate. The organic layer was washed with water and brine, driedover anhydrous sodium sulfate, and filtrated, and the solvent wasremoved. The obtained crude product was purified by silica gel columnchromatography (heptane:ethyl acetate=67:33 to 33:67). The obtainedsolid was recrystallized from 2-propanol to afford the title compound asa white powder (107 mg).

Melting point: 176.6-178.2° C.

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 1.

Example 26-[3,5-Dichloro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 1.29 (6H, s), 2.24 (1H, d,J=16.7 Hz), 2.69 (1H, dd, J=16.7, 7.0 Hz), 3.37-3.49 (1H, m), 3.75 (2H,s), 4.68 (1H, brs), 7.82 (2H, s), 11.09 (1H, s).

Example 36-[3-Chloro-2-fluoro-4-(2-hydroxyethoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 2.25 (1H, dd, J=16.7, 3.5Hz), 2.69 (1H, dd, J=16.7, 6.7 Hz), 3.10-3.20 (1H, m), 3.76 (2H, dt,J=5.4, 5.0 Hz), 4.17 (2H, t, J=5.0 Hz), 4.91 (1H, t, J=5.4 Hz), 7.10(1H, dd, J=8.9, 1.5 Hz), 7.53 (1H, t, J=8.9 Hz), 11.01 (1H, s).

Example 46-[3-Chloro-4-(2-hydroxyethoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Melting point: 157.4-157.6° C.

Example 5 Production of6-[3-chloro-2-fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

A suspension of6-(3-chloro-2-fluoro-4-hydroxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 89, 302 mg), 3-bromo-2,2-dimethyl-1-propanol (0.434mL), and cesium carbonate (767 mg) in NMP (3 mL) was stirred at 130° C.under microwave irradiation for one hour. The reaction mixture waspoured into water, and the mixture was extracted with ethyl acetate. Theorganic layer was washed with water and brine, dried over anhydroussodium sulfate, and filtrated, and the solvent was removed. The obtainedcrude product was purified by amino silica gel column chromatography(heptane:ethyl acetate=50:50 to 0:100 to ethyl acetate:methanol=90:10),and the desired fractions were concentrated. The residue wascrystallized from ethyl acetate, and the precipitates were collected ona filter to afford the title compound as a white powder (37 mg).

¹H-NMR (DMSO-d6) δ: 0.96 (6H, s), 1.04 (3H, d, J=7.1 Hz), 2.25 (1H, dd,J=16.9, 3.7 Hz), 2.69 (1H, dd, J=16.9, 6.8 Hz), 3.11-3.18 (1H, m), 3.31(2H, d, J=5.4 Hz), 3.86 (2H, s), 4.65 (1H, t, J=5.4 Hz), 7.06 (1H, dd,J=8.8, 1.5 Hz), 7.53 (1H, t, J=8.8 Hz), 11.01 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 5.

Example 66-[3,5-Difluoro-4-(3-hydroxy-2,2-dimethylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.93 (6H, s), 1.04 (3H, d, J=7.3 Hz), 2.23 (1H, d,J=16.7 Hz), 2.68 (1H, dd, J=16.7, 7.0 Hz), 3.27 (2H, d, J=5.3 Hz),3.34-3.42 (1H, m), 3.92 (2H, s), 4.62 (1H, t, J=5.3 Hz), 7.44-7.57 (2H,m), 11.05 (1H, s).

Example 76-[3-Chloro-5-fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.96 (6H, s), 1.04 (3H, d, J=7.3 Hz), 2.23 (1H, d,J=16.9 Hz), 2.69 (1H, dd, J=16.9, 6.8 Hz), 3.29-3.34 (2H, m), 3.36-3.46(1H, m), 3.92 (2H, d, J=1.7 Hz), 4.61 (1H, brs), 7.63 (1H, dd, J=12.8,2.1 Hz), 7.66-7.68 (1H, m), 11.06 (1H, s).

Example 86-[2-Fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.95 (6H, s), 1.03 (3H, d, J=7.2 Hz), 2.11 (3H, d,J=2.2 Hz), 2.22 (1H, dd, J=16.7, 3.7 Hz), 2.66 (1H, dd, J=16.7, 6.7 Hz),3.07-3.16 (1H, m), 3.29-3.32 (2H, m), 3.75 (2H, s), 4.63 (1H, t, J=5.4Hz), 6.84 (1H, d, J=8.5 Hz), 7.37 (1H, t, J=8.5 Hz), 10.91 (1H, s).

Example 96-[2,3-Difluoro-4-(3-hydroxy-2,2-dimethylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.94 (6H, s), 1.05 (3H, d, J=7.3 Hz), 2.25 (1H, dd,J=16.7, 3.3 Hz), 2.70 (1H, dd, J=16.7, 7.0 Hz), 3.10-3.22 (1H, m), 3.28(2H, d, J=5.4 Hz), 3.85 (2H, s), 4.67 (1H, t, J=5.4 Hz), 7.03-7.14 (1H,m), 7.30-7.45 (1H, m), 11.02 (1H, s).

Example 106-[2,3-Difluoro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.1 Hz), 1.84-1.95 (2H, m), 2.25 (1H,dd, J=16.9, 3.3 Hz), 2.70 (1H, dd, J=16.9, 6.8 Hz), 3.09-3.23 (1H, m),3.49-3.64 (2H, m), 4.20 (2H, t, J=6.3 Hz), 4.59 (1H, t, J=5.1 Hz),7.03-7.15 (1H, m), 7.34-7.44 (1H, m), 11.03 (1H, s).

Example 116-[3-Bromo-5-fluoro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 1.82-1.92 (2H, m), 2.23 (1H,d, J=16.8 Hz), 2.69 (1H, dd, J=16.8, 6.9 Hz), 3.35-3.45 (1H, m),3.55-3.64 (2H, m), 4.16-4.24 (2H, m), 4.54 (1H, t, J=4.8 Hz), 7.67 (1H,dd, J=12.7, 2.1 Hz), 7.82 (1H, t, J=2.1 Hz), 11.07 (1H, s).

Example 126-[3-Bromo-2-fluoro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 1.85-1.95 (2H, m), 2.24 (1H,dd, J=16.9, 3.7 Hz), 2.69 (1H, dd, J=16.9, 6.8 Hz), 3.09-3.19 (1H, m),3.56-3.64 (2H, m), 4.20 (2H, t, J=6.2 Hz), 4.58 (1H, t, J=5.2 Hz), 7.04(1H, dd, J=8.9, 1.0 Hz), 7.58 (1H, t, J=8.9 Hz), 11.02 (1H, s).

Example 136-[3,5-Difluoro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 1.77-1.89 (2H, m), 2.24 (1H,d, J=16.7 Hz), 2.68 (1H, dd, J=16.7, 7.0 Hz), 3.33-3.47 (1H, m),3.51-3.62 (2H, m), 4.23 (2H, t, J=6.3 Hz), 4.53 (1H, t, J=5.0 Hz),7.45-7.61 (2H, m), 11.06 (1H, s).

Example 146-[4-(3-Hydroxypropoxy)-3,5-dimethylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 1.84-1.93 (2H, m), 2.21 (1H,d, J=16.8 Hz), 2.24 (6H, s), 2.64 (1H, dd, J=16.8, 6.9 Hz), 3.30-3.40(1H, m), 3.58-3.66 (2H, m), 3.82 (2H, t, J=6.4 Hz), 4.50 (1H, t, J=5.1Hz), 7.44 (2H, s), 10.86 (1H, s).

Example 156-[3-Chloro-5-fluoro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 1.80-1.92 (2H, m), 2.24 (1H,d, J=16.9 Hz), 2.69 (1H, dd, J=16.9, 7.0 Hz), 3.35-3.47 (1H, m),3.52-3.64 (2H, m), 4.14-4.26 (2H, m), 4.53 (1H, t, J=5.1 Hz), 7.60-7.72(2H, m), 11.06 (1H, s).

Example 166-[3,5-Dichloro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 1.87-1.98 (2H, m), 2.23 (1H,d, J=17.0 Hz), 2.69 (1H, dd, J=17.0, 7.0 Hz), 3.36-3.49 (1H, m),3.57-3.66 (2H, m), 4.10 (2H, t, J=6.5 Hz), 4.53 (1H, t, J=5.1 Hz), 7.82(2H, s), 11.08 (1H, s).

Example 176-[3-Chloro-4-(3-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Melting point: 129.7-132.6° C.

Example 186-[3-Bromo-5-chloro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Melting point: 153.0-156.6° C.

Example 196-[3-Chloro-2-fluoro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 1.87-1.93 (2H, m), 2.25 (1H,dd, J=16.7, 3.5 Hz), 2.70 (1H, dd, J=16.7, 6.7 Hz), 3.10-3.19 (1H, m),3.56-3.62 (2H, m), 4.21 (2H, t, J=6.3 Hz), 4.59 (1H, t, J=5.1 Hz), 7.09(1H, dd, J=8.8, 1.5 Hz), 7.55 (1H, t, J=8.8 Hz), 11.02 (1H, s).

Example 206-[3-Fluoro-4-(3-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 1.80-1.90 (2H, m), 2.22 (1H,d, J=16.8 Hz), 2.27 (3H, s), 2.66 (1H, dd, J=16.8, 6.9 Hz), 3.31-3.41(1H, m), 3.55-3.62 (2H, m), 4.06-4.13 (2H, m), 4.52 (1H, t, J=5.1 Hz),7.40-7.48 (2H, m), 10.95 (1H, s).

Example 216-[2-Fluoro-4-(3-hydroxypropoxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.2 Hz), 1.84-1.93 (2H, m), 2.08 (3H,d, J=2.2 Hz), 2.22 (1H, dd, J=16.8, 3.7 Hz), 2.66 (1H, dd, J=16.8, 6.7Hz), 3.07-3.17 (1H, m), 3.55-3.63 (2H, m), 4.10 (2H, t, J=6.2 Hz), 4.56(1H, t, J=5.2 Hz), 6.87 (1H, d, J=8.8 Hz), 7.38 (1H, t, J=8.8 Hz), 10.92(1H, s).

Example 226-[3-Chloro-2-fluoro-4-(3-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 1.87-1.96 (2H, m), 2.22-2.29(1H, m), 2.27 (3H, s), 2.69 (1H, dd, J=16.8, 6.8 Hz), 3.09-3.19 (1H, m),3.59-3.66 (2H, m), 4.02 (2H, t, J=6.5 Hz), 4.54 (1H, t, J=5.1 Hz), 7.43(1H, d, J=8.7 Hz), 11.07 (1H, s).

Example 236-[3-Ethyl-2-fluoro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.15 (3H, t, J=7.6 Hz), 1.19 (3H, d, J=7.3 Hz),1.56-1.62 (1H, m), 2.09 (2H, quintet, J=6.1 Hz), 2.41 (1H, dd, J=16.9,3.4 Hz), 2.63-2.78 (3H, m), 3.21-3.33 (1H, m), 3.85-3.93 (2H, m), 4.16(2H, t, J=6.1 Hz), 6.70 (1H, d, J=8.3 Hz), 7.33-7.38 (1H, m), 8.49 (1H,brs).

Example 24 Production of6-[3-bromo-2-fluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Under an argon atmosphere, to a solution of6-[3-bromo-2-fluoro-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 114, 357 mg) in THF (10 mL) was added dropwisemethylmagnesium bromide (3 M diethyl ether solution, 1.0 mL) at 0° C.The reaction mixture was stirred at room temperature for 23 hours. Thereaction mixture was cooled at 0° C., aqueous ammonium chloride wasadded thereto, and the mixture was extracted with ethyl acetate. Theorganic layer was washed with brine, dried over anhydrous sodiumsulfate, and filtrated, and the solvent was removed. The obtained crudeproduct was purified by silica gel column chromatography (heptane:ethylacetate=33:67 to 6:94). The obtained solid was washed by triturationwith diisopropyl ether, and then collected on a filter to afford thetitle compound as a white solid (18 mg).

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 1.25 (6H, s), 2.24 (1H, dd,J=16.8, 3.7 Hz), 2.69 (1H, dd, J=16.8, 6.8 Hz), 3.09-3.19 (1H, m), 3.86(2H, s), 4.70 (1H, s), 7.03 (1H, dd, J=8.9, 1.2 Hz), 7.57 (1H, t, J=8.9Hz), 11.01 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 24.

Example 256-[3-Chloro-5-fluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 1.25 (6H, s), 2.24 (1H, d,J=16.7 Hz), 2.69 (1H, dd, J=16.7, 7.0 Hz), 3.35-3.45 (1H, m), 3.87 (2H,d, J=1.2 Hz), 4.64 (1H, s), 7.64 (1H, dd, J=12.7, 2.2 Hz), 7.68 (1H, t,J=2.2 Hz), 11.06 (1H, s).

Example 266-[3-Bromo-5-fluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 1.26 (6H, s), 2.23 (1H, d,J=16.8 Hz), 2.69 (1H, dd, J=16.8, 6.9 Hz), 3.34-3.45 (1H, m), 3.86 (2H,d, J=1.3 Hz), 4.64 (1H, s), 7.67 (1H, dd, J=12.9, 2.1 Hz), 7.81 (1H, t,J=2.1 Hz), 11.06 (1H, s).

Example 27 Production of6-[2,3-difluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

A suspension of6-(2,3-difluoro-4-hydroxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one(480 mg), 2,2-dimethyloxirane (0.231 mL), and potassium carbonate (415mg) in DMF (3 mL) was stirred at 160° C. under microwave irradiation for30 minutes. The reaction mixture was poured into water, and the mixturewas extracted with ethyl acetate. The organic layer was washed withwater and brine, dried over anhydrous sodium sulfate, and filtrated, andthe solvent was removed. The obtained crude product was purified bysilica gel column chromatography (heptane:ethyl acetate=60:40 to 33:67).The obtained solid was washed by trituration with diisopropyl ether, andthen collected on a filter to afford the title compound as a white solid(326 mg).

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 1.21 (6H, s), 2.25 (1H, dd,J=16.9, 3.4 Hz), 2.70 (1H, dd, J=16.9, 6.7 Hz), 3.11-3.21 (1H, m), 3.87(2H, s), 4.71 (1H, s), 7.06-7.13 (1H, m), 7.34-7.41 (1H, m), 11.02 (1H,s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 27.

Example 286-[2-Hydroxy-4-(2-hydroxy-2-methylpropoxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.10 (3H, d, J=7.3 Hz), 1.23 (6H, s), 2.05 (3H, s),2.23-2.31 (1H, m), 2.76 (1H, dd, J=16.7, 6.7 Hz), 3.47-3.57 (1H, m),3.74 (2H, s), 4.65 (1H, s), 6.55 (1H, d, J=9.0 Hz), 7.42 (1H, d, J=9.0Hz), 11.03 (1H, s), 12.46 (1H, s).

Example 296-[3-Chloro-2-fluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 1.24 (6H, s), 2.25 (1H, dd,J=16.9, 3.7 Hz), 2.70 (1H, dd, J=16.9, 6.7 Hz), 3.09-3.20 (1H, m), 3.87(2H, s), 4.71 (1H, s), 7.06-7.11 (1H, m), 7.53 (1H, t, J=8.8 Hz), 11.02(1H, s).

Example 306-[3,5-Difluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 1.20 (6H, s), 2.20-2.27 (1H,m), 2.68 (1H, dd, J=16.7, 7.0 Hz), 3.33-3.43 (1H, m), 3.89 (2H, s), 4.61(1H, s), 7.46-7.55 (2H, m), 11.05 (1H, s).

Example 316-[3-Chloro-4-(2-hydroxy-2-methylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 1.28 (6H, s), 2.19-2.26 (1H,m), 2.33 (3H, s), 2.67 (1H, dd, J=16.9, 6.8 Hz), 3.33-3.43 (1H, m), 3.64(2H, s), 4.64 (1H, s), 7.58-7.67 (2H, m), 10.98 (1H, s).

Example 326-[4-(2-Hydroxy-2-methylpropoxy)-3,5-dimethylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.4 Hz), 1.27 (6H, s), 2.21 (1H, d,J=16.7 Hz), 2.26 (6H, s), 2.64 (1H, dd, J=16.7, 6.8 Hz), 3.32-3.40 (1H,m), 3.46-3.52 (2H, m), 4.60 (1H, s), 7.45 (2H, s), 10.87 (1H, s).

Example 336-[3-Fluoro-4-(2-hydroxy-2-methylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 1.23 (6H, s), 2.22 (1H, d,J=16.7 Hz), 2.30 (3H, s), 2.66 (1H, dd, J=16.7, 6.8 Hz), 3.31-3.42 (1H,m), 3.77 (2H, d, J=1.5 Hz), 4.61 (1H, s), 7.41-7.49 (2H, m), 10.95 (1H,s).

Example 346-[2-Fluoro-4-(2-hydroxy-2-methylpropoxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.2 Hz), 1.23 (6H, s), 2.13 (3H, d,J=2.2 Hz), 2.23 (1H, dd, J=16.7, 3.7 Hz), 2.66 (1H, dd, J=16.7, 6.7 Hz),3.06-3.18 (1H, m), 3.76 (2H, s), 4.68 (1H, s), 6.84 (1H, d, J=8.7 Hz),7.37 (1H, t, J=8.7 Hz), 10.92 (1H, s).

Example 356-[5-Chloro-2-fluoro-4-(2-hydroxy-2-methylpropoxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.1 Hz), 1.28 (6H, s), 2.21-2.29 (1H,m), 2.24 (3H, d, J=2.4 Hz), 2.68 (1H, dd, J=16.8, 6.8 Hz), 3.08-3.19(1H, m), 3.67 (2H, s), 4.69 (1H, s), 7.52 (1H, d, J=7.9 Hz), 11.06 (1H,s).

Example 366-[3-Chloro-2-fluoro-4-(2-hydroxy-2-methylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 1.28 (6H, s), 2.25 (1H, dd,J=16.9, 3.8 Hz), 2.29 (3H, s), 2.69 (1H, dd, J=16.8, 6.8 Hz), 3.09-3.20(1H, m), 3.68 (2H, s), 4.67 (1H, s), 7.43 (1H, d, J=8.4 Hz), 11.07 (1H,s).

Example 376-{3-Chloro-5-fluoro-4-[3,3,3-trifluoro-2-hydroxy-2-(trifluoromethyl)propoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 2.24 (1H, d, J=16.7 Hz),2.70 (1H, dd, J=16.7, 7.0 Hz), 3.36-3.47 (1H, m), 4.48 (2H, s),7.66-7.74 (2H, m), 8.46 (1H, brs), 11.11 (1H, s).

Example 386-{3-Bromo-5-fluoro-4-[3,3,3-trifluoro-2-hydroxy-2-(trifluoromethyl)propoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 2.19-2.30 (1H, m), 2.70 (1H,dd, J=16.7, 7.0 Hz), 3.35-3.48 (1H, m), 4.47 (2H, s), 7.72 (1H, dd,J=12.7, 2.2 Hz), 7.82-7.86 (1H, m), 8.44 (1H, s), 11.10 (1H, s).

Example 396-{3-Chloro-4-[(2S)-2-hydroxypropoxy]-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.24 (3H, d, J=7.3 Hz), 1.28 (3H, d, J=6.6 Hz), 2.36(3H, s), 2.47 (1H, dd, J=16.9, 1.2 Hz), 2.61 (1H, d, J=3.4 Hz), 2.69(1H, dd, J=16.9, 6.8 Hz), 3.23-3.34 (1H, m), 3.77-3.83 (1H, m),3.91-3.96 (1H, m), 4.20-4.31 (1H, m), 7.49 (1H, d, J=2.2 Hz), 7.61 (1H,d, J=2.2 Hz), 8.62 (1H, s).

Example 406-{3-Chloro-4-[(2R)-2-hydroxypropoxy]-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.1 Hz), 1.19 (3H, d, J=6.4 Hz),2.20-2.26 (1H, m), 2.33 (3H, s), 2.66 (1H, dd, J=16.9, 6.8 Hz),3.32-3.42 (1H, m), 3.67-3.83 (2H, m), 3.92-4.03 (1H, m), 4.86 (1H, brs),7.60 (1H, d, J=2.0 Hz), 7.65 (1H, d, J=2.0 Hz), 10.98 (1H, s).

Example 41 Production of6-{3-chloro-5-fluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of methyl4-{3-chloro-5-fluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-3-methyl-4-oxobutanoate(Reference example 55, 352 mg) in ethanol (10 mL) were added hydrazinemonohydrate (0.149 mL) and acetic acid (0.175 mL), and then the mixturewas refluxed for 8 hours. Water was added to the reaction mixture, andthe mixture was extracted with ethyl acetate. The organic layer waswashed with brine, dried over anhydrous sodium sulfate, and filtrated,and the solvent was removed. The obtained crude product was purified bysilica gel column chromatography (heptane:ethyl acetate=25:75 to 0:100),and the desired fractions were concentrated. The residue wasrecrystallized from 2-propanol to afford the title compound as a whitesolid (91 mg).

¹H-NMR (DMSO-d6) δ: 0.61-0.73 (4H, m), 1.04 (3H, d, J=7.3 Hz), 2.23 (1H,d, J=16.7 Hz), 2.69 (1H, dd, J=16.7, 7.0 Hz), 3.35-3.46 (1H, m), 4.10(2H, s), 5.54 (1H, s), 7.63 (1H, dd, J=12.5, 2.2 Hz), 7.66-7.69 (1H, m),11.06 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 41.

Example 426-{2,3-Difluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.61-0.75 (4H, m), 1.05 (3H, d, J=7.2 Hz), 2.25 (1H,dd, J=16.8, 3.4 Hz), 2.70 (1H, dd, J=16.8, 6.8 Hz), 3.12-3.22 (1H, m),4.12 (2H, s), 5.65 (1H, s), 7.05-7.13 (1H, m), 7.33-7.41 (1H, m), 11.02(1H, s).

Example 436-{4-[(1-Hydroxycyclopropyl)methoxy]-3,5-dimethylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.58-0.72 (4H, m), 1.05 (3H, d, J=7.3 Hz), 2.21 (1H,d, J=16.8 Hz), 2.27 (6H, s), 2.64 (1H, dd, J=16.8, 6.9 Hz), 3.30-3.39(1H, m), 3.74 (2H, s), 5.62 (1H, s), 7.44 (2H, s), 10.86 (1H, s).

Example 446-{3-Chloro-4-[(1-hydroxycyclopropyl)methoxy]-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.60-0.74 (4H, m), 1.05 (3H, d, J=7.3 Hz), 2.23 (1H,d, J=16.7 Hz), 2.36 (3H, s), 2.67 (1H, dd, J=16.7, 7.0 Hz), 3.32-3.43(1H, m), 3.90 (2H, s), 5.62 (1H, s), 7.59 (1H, d, J=2.1 Hz), 7.65 (1H,d, J=2.1 Hz), 10.97 (1H, s).

Example 456-{3-Fluoro-4-[(1-hydroxycyclopropyl)methoxy]-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.55-0.70 (4H, m), 1.05 (3H, d, J=7.2 Hz), 2.22 (1H,d, J=16.8 Hz), 2.33 (3H, s), 2.66 (1H, dd, J=16.8, 6.8 Hz), 3.32-3.42(1H, m), 4.00 (2H, s), 5.53 (1H, s), 7.40-7.48 (2H, m), 10.95 (1H, s).

Example 466-{2-Fluoro-4-[(1-hydroxycyclopropyl)methoxy]-3-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.60-0.75 (4H, m), 1.03 (3H, d, J=7.2 Hz), 2.13 (3H,d, J=2.2 Hz), 2.22 (1H, dd, J=16.8, 3.7 Hz), 2.66 (1H, dd, J=16.8, 6.7Hz), 3.07-3.18 (1H, m), 4.03 (2H, s), 5.60 (1H, s), 6.86 (1H, d, J=8.7Hz), 7.35 (1H, t, J=8.7 Hz), 10.92 (1H, s).

Example 476-{3-Chloro-2-fluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.61-0.76 (4H, m), 1.04 (3H, d, J=7.2 Hz), 2.25 (1H,dd, J=16.7, 3.7 Hz), 2.70 (1H, dd, J=16.7, 6.8 Hz), 3.10-3.19 (1H, m),4.15 (2H, s), 5.61 (1H, s), 7.10 (1H, dd, J=9.0, 1.3 Hz), 7.52 (1H, t,J=9.0 Hz), 11.03 (1H, s).

Example 48 Production of6-[3-bromo-2-fluoro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of6-[3-bromo-2-fluoro-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 114, 321 mg) in methanol (4.5 mL) was added sodiumborohydride (68 mg) at 0° C., and then the mixture was stirred at thesame temperature for one hour. To the reaction mixture were added waterand brine, and then the mixture was extracted with ethyl acetate. Theorganic layer was dried over anhydrous sodium sulfate, and filtrated,and the solvent was removed. The obtained solid was washed bytrituration with diisopropyl ether, and then collected on a filter toafford the title compound as a white solid (270 mg).

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 1.20 (3H, d, J=6.0 Hz), 2.24(1H, dd, J=16.8, 3.7 Hz), 2.69 (1H, dd, J=16.8, 6.8 Hz), 3.09-3.19 (1H,m), 3.88-4.08 (3H, m), 4.92 (1H, d, J=4.6 Hz), 7.04 (1H, dd, J=8.9, 1.1Hz), 7.57 (1H, t, J=8.9 Hz), 11.01 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 48.

Example 496-[2,3-Difluoro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.1 Hz), 1.16 (3H, d, J=6.1 Hz), 2.25(1H, dd, J=16.9, 3.2 Hz), 2.70 (1H, dd, J=16.9, 6.8 Hz), 3.10-3.22 (1H,m), 3.91-4.05 (3H, m), 4.96 (1H, d, J=4.6 Hz), 7.05-7.14 (1H, m),7.33-7.42 (1H, m), 11.03 (1H, s).

Example 506-[3-Bromo-5-fluoro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 1.20 (3H, d, J=6.1 Hz), 2.23(1H, d, J=16.8 Hz), 2.69 (1H, dd, J=16.8, 6.9 Hz), 3.35-3.45 (1H, m),3.83-4.07 (3H, m), 4.86 (1H, d, J=4.8 Hz), 7.67 (1H, dd, J=12.7, 2.1Hz), 7.81 (1H, t, J=2.1 Hz), 11.06 (1H, s).

Example 516-[4-(2-Hydroxypropoxy)-3,5-dimethylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.4 Hz), 1.19 (3H, d, J=6.3 Hz), 2.21(1H, d, J=16.7 Hz), 2.26 (6H, s), 2.64 (1H, dd, J=16.7, 6.8 Hz),3.29-3.40 (1H, m), 3.54-3.66 (2H, m), 3.91-4.01 (1H, m), 4.85 (1H, d,J=4.9 Hz), 7.44 (2H, s), 10.86 (1H, s).

Example 526-[3-Chloro-5-fluoro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 1.18 (3H, d, J=5.9 Hz), 2.24(1H, d, J=16.9 Hz), 2.69 (1H, dd, J=16.9, 6.8 Hz), 3.35-3.46 (1H, m),3.81-4.06 (3H, m), 4.86 (1H, d, J=4.6 Hz), 7.58-7.72 (2H, m), 11.06 (1H,s).

Example 536-[3,5-Dichloro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 1.21 (3H, d, J=6.1 Hz), 2.24(1H, d, J=16.7 Hz), 2.69 (1H, dd, J=16.7, 7.0 Hz), 3.37-3.47 (1H, m),3.74-3.81 (1H, m), 3.89-3.96 (1H, m), 3.97-4.07 (1H, m), 4.89 (1H, d,J=4.9 Hz), 7.82 (2H, s), 11.09 (1H, s).

Example 546-[3-Chloro-2-fluoro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 1.18 (3H, d, J=6.1 Hz), 2.25(1H, dd, J=16.9, 3.7 Hz), 2.70 (1H, dd, J=16.9, 6.8 Hz), 3.10-3.19 (1H,m), 3.91-4.05 (3H, m), 4.93 (1H, d, J=4.6 Hz), 7.09 (1H, dd, J=8.8, 1.2Hz), 7.53 (1H, t, J=8.8 Hz), 11.02 (1H, s).

Example 556-[3-Chloro-4-(2-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.24 (3H, d, J=7.3 Hz), 1.28 (3H, d, J=6.4 Hz), 2.36(3H, s), 2.47 (1H, dd, J=16.8, 1.0 Hz), 2.61 (1H, d, J=3.7 Hz), 2.69(1H, dd, J=16.8, 6.8 Hz), 3.23-3.33 (1H, m), 3.77-3.83 (1H, m),3.92-3.96 (1H, m), 4.19-4.31 (1H, m), 7.49 (1H, dd, J=2.2, 0.5 Hz), 7.61(1H, d, J=2.2 Hz), 8.67 (1H, brs).

Example 566-[3-Fluoro-4-(2-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 1.16 (3H, d, J=6.1 Hz), 2.22(1H, d, J=16.7 Hz), 2.29 (3H, s), 2.66 (1H, dd, J=16.7, 6.8 Hz),3.30-3.42 (1H, m), 3.80-3.97 (3H, m), 4.83 (1H, d, J=4.6 Hz), 7.40-7.50(2H, m), 10.95 (1H, s).

Example 576-[3-Bromo-5-chloro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.24 (3H, d, J=7.3 Hz), 1.28 (3H, d, J=6.4 Hz), 2.49(1H, dd, J=17.1, 1.0 Hz), 2.66-2.75 (2H, m), 3.20-3.31 (1H, m),3.88-3.94 (1H, m), 4.10-4.14 (1H, m), 4.21-4.34 (1H, m), 7.74 (1H, d,J=2.2 Hz), 7.87 (1H, d, J=2.2 Hz), 8.72 (1H, brs).

Example 586-[2-Fluoro-4-(2-hydroxypropoxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.2 Hz), 1.18 (3H, d, J=6.2 Hz), 2.11(3H, d, J=2.2 Hz), 2.22 (1H, dd, J=16.8, 3.7 Hz), 2.66 (1H, dd, J=16.8,6.7 Hz), 3.06-3.18 (1H, m), 3.80-4.03 (3H, m), 4.89 (1H, d, J=4.8 Hz),6.86 (1H, d, J=8.7 Hz), 7.36 (1H, t, J=8.7 Hz), 10.92 (1H, s).

Example 596-[2-Fluoro-4-(2-hydroxypropoxy)-3-vinylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 1.18 (3H, d, J=6.1 Hz), 2.23(1H, dd, J=16.9, 3.9 Hz), 2.66 (1H, dd, J=16.9, 6.8 Hz), 3.06-3.18 (1H,m), 3.86-4.06 (3H, m), 4.93 (1H, d, J=4.6 Hz), 5.51-5.59 (1H, m),6.02-6.10 (1H, m), 6.81 (1H, dd, J=18.1, 12.0 Hz), 6.94 (1H, d, J=8.8Hz), 7.43 (1H, t, J=8.8 Hz), 10.96 (1H, brs).

Example 606-[3-Ethyl-2-fluoro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.16 (3H, t, J=7.6 Hz), 1.20 (3H, d, J=7.3 Hz), 1.32(3H, d, J=6.4 Hz), 2.13-2.18 (1H, m), 2.42 (1H, dd, J=16.9, 3.4 Hz),2.66-2.78 (3H, m), 3.21-3.33 (1H, m), 3.84-3.91 (1H, m), 3.98 (1H, dd,J=9.0, 3.4 Hz), 4.18-4.30 (1H, m), 6.68 (1H, d, J=8.5 Hz), 7.36 (1H, t,J=8.5 Hz), 8.49 (1H, brs).

Example 616-[2,3-Difluoro-4-(2-hydroxybutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.93 (3H, t, J=7.4 Hz), 1.05 (3H, d, J=7.1 Hz),1.34-1.48 (1H, m), 1.50-1.63 (1H, m), 2.25 (1H, dd, J=16.9, 3.3 Hz),2.70 (1H, dd, J=16.9, 6.8 Hz), 3.09-3.23 (1H, m), 3.67-3.78 (1H, m),3.94-4.07 (2H, m), 4.93 (1H, d, J=5.4 Hz), 7.06-7.14 (1H, m), 7.31-7.43(1H, m), 11.02 (1H, s).

Example 626-[3-Chloro-5-fluoro-4-(2-hydroxybutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.92 (3H, t, J=7.4 Hz), 1.04 (3H, d, J=7.3 Hz),1.34-1.50 (1H, m), 1.56-1.71 (1H, m), 2.24 (1H, d, J=17.0 Hz), 2.69 (1H,dd, J=17.0, 7.0 Hz), 3.35-3.46 (1H, m), 3.63-3.75 (1H, m), 3.92-4.09(2H, m), 4.82 (1H, d, J=5.4 Hz), 7.57-7.72 (2H, m), 11.06 (1H, s).

Example 636-[3,5-Dichloro-4-(2-hydroxybutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.95 (3H, t, J=7.4 Hz), 1.04 (3H, d, J=7.3 Hz),1.35-1.52 (1H, m), 1.60-1.76 (1H, m), 2.24 (1H, d, J=16.9 Hz), 2.69 (1H,dd, J=16.9, 6.8 Hz), 3.37-3.47 (1H, m), 3.71-3.81 (1H, m), 3.82-3.88(1H, m), 3.89-3.96 (1H, m), 4.85 (1H, d, J=5.4 Hz), 7.82 (2H, s), 11.08(1H, s).

Example 646-[3-Chloro-2-fluoro-4-(2-hydroxybutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.93 (3H, t, J=7.4 Hz), 1.04 (3H, d, J=7.1 Hz),1.39-1.50 (1H, m), 1.56-1.67 (1H, m), 2.25 (1H, dd, J=16.7, 3.7 Hz),2.69 (1H, dd, J=16.7, 6.7 Hz), 3.10-3.18 (1H, m), 3.71-3.78 (1H, m),3.98-4.06 (2H, m), 4.90 (1H, d, J=5.4 Hz), 7.10 (1H, dd, J=8.9, 1.5 Hz),7.53 (1H, t, J=8.9 Hz), 11.02 (1H, s).

Example 656-[3-Chloro-4-(2-hydroxybutoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.04 (3H, t, J=7.6 Hz), 1.24 (3H, d, J=7.3 Hz), 1.61(2H, quintet, J=7.6 Hz), 2.36 (3H, s), 2.47 (1H, dd, J=16.8, 1.0 Hz),2.56 (1H, d, J=3.9 Hz), 2.69 (1H, dd, J=16.8, 6.8 Hz), 3.23-3.34 (1H,m), 3.83-3.88 (1H, m), 3.93-4.04 (2H, m), 7.47-7.51 (1H, m), 7.61 (1H,d, J=2.2 Hz), 8.65 (1H, brs).

Example 666-[3-Bromo-5-chloro-4-(2-hydroxybutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.05 (3H, t, J=7.3 Hz), 1.24 (3H, d, J=7.3 Hz), 1.62(2H, quintet, J=6.8 Hz), 2.49 (1H, d, J=16.9 Hz), 2.63-2.75 (2H, m),3.20-3.31 (1H, m), 3.93-4.06 (2H, m), 4.10-4.18 (1H, m), 7.74 (1H, d,J=2.2 Hz), 7.86 (1H, d, J=2.2 Hz), 8.66 (1H, brs).

Example 676-[2-Fluoro-4-(2-hydroxybutoxy)-3-vinylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.05 (3H, t, J=7.3 Hz), 1.19 (3H, d, J=7.3 Hz),1.59-1.70 (2H, m), 2.15 (1H, d, J=3.7 Hz), 2.42 (1H, dd, J=17.1, 3.7Hz), 2.73 (1H, dd, J=17.1, 6.8 Hz), 3.21-3.33 (1H, m), 3.90-4.10 (3H,m), 5.53-5.61 (1H, m), 5.97-6.06 (1H, m), 6.69-6.75 (1H, m), 6.78 (1H,dd, J=18.1, 12.0 Hz), 7.40 (1H, t, J=8.8 Hz), 8.55 (1H, brs).

Example 68 Production of6-[3-bromo-5-chloro-4-(3-hydroxy-2,2-dimethylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Under an argon atmosphere, to a mixture of methyl3-[2-bromo-6-chloro-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]-2,2-dimethylpropionate(Reference example 129, 342 mg) in THF (10 mL) was slowly addeddiisobutylaluminum hydride (1 M n-hexane solution, 3.17 mL) at 0° C. Themixture was stirred at room temperature for 2 hours, hydrochloric acidwas added to the reaction mixture, and the mixture was extracted withethyl acetate. The organic layer was washed with water and brine, driedover anhydrous sodium sulfate, and filtrated, and the solvent wasremoved. The obtained crude product was purified by silica gel columnchromatography (heptane:ethyl acetate=50:50 to 25:75). The obtainedsolid was recrystallized from 2-propanol to afford the title compound asa white powder (111 mg).

Melting point: 198.0-199.7° C.

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 68.

Example 696-[3-Bromo-5-fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.98 (6H, s), 1.04 (3H, d, J=7.3 Hz), 2.23 (1H, d,J=16.9 Hz), 2.69 (1H, dd, J=16.9, 6.8 Hz), 3.30-3.34 (2H, m), 3.34-3.45(1H, m), 3.92 (2H, d, J=1.8 Hz), 4.61 (1H, t, J=5.3 Hz), 7.66 (1H, dd,J=13.1, 2.2 Hz), 7.79-7.83 (1H, m), 11.05 (1H, s).

Example 706-[3-Bromo-2-fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.97 (6H, s), 1.04 (3H, d, J=7.2 Hz), 2.24 (1H, dd,J=16.8, 3.7 Hz), 2.69 (1H, dd, J=16.8, 6.8 Hz), 3.09-3.19 (1H, m), 3.33(2H, d, J=5.4 Hz), 3.85 (2H, s), 4.65 (1H, t, J=5.4 Hz), 7.01 (1H, dd,J=8.9, 1.2 Hz), 7.57 (1H, t, J=8.9 Hz), 11.01 (1H, s).

Example 716-[4-(3-Hydroxy-2,2-dimethylpropoxy)-3,5-dimethylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.99 (6H, s), 1.05 (3H, d, J=7.2 Hz), 2.21 (1H, d,J=16.8 Hz), 2.25 (6H, s), 2.64 (1H, dd, J=16.8, 6.8 Hz), 3.30-3.38 (3H,m), 3.47 (2H, s), 4.58 (1H, t, J=5.1 Hz), 7.44 (2H, s), 10.86 (1H, s).

Example 726-[3-Chloro-4-(3-hydroxy-2,2-dimethylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.09 (6H, s), 1.24 (3H, d, J=7.6 Hz), 2.14 (1H, t,J=6.4 Hz), 2.35 (3H, s), 2.47 (1H, dd, J=16.8, 1.0 Hz), 2.69 (1H, dd,J=16.8, 6.8 Hz), 3.23-3.34 (1H, m), 3.65 (2H, d, J=6.4 Hz), 3.74 (2H,s), 7.48 (1H, dd, J=2.2, 0.7 Hz), 7.61 (1H, d, J=2.2 Hz), 8.63 (1H,brs).

Example 736-[3-Fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.95 (6H, s), 1.05 (3H, d, J=7.2 Hz), 2.22 (1H, d,J=16.7 Hz), 2.28 (3H, s), 2.66 (1H, dd, J=16.7, 7.0 Hz), 3.27-3.42 (3H,m), 3.79 (2H, d, J=1.7 Hz), 4.60 (1H, t, J=5.3 Hz), 7.39-7.48 (2H, m),10.94 (1H, s).

Example 74 Production of6-[2-hydroxy-4-(2-hydroxypropoxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of6-[2-(methoxymethyloxy)-3-methyl-4-(2-oxopropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 107, 120 mg) in methanol (2 mL) was added sodiumborohydride (27 mg) at 0° C., and the mixture was stirred at roomtemperature for one hour. The reaction mixture was poured into water,and the mixture was extracted with ethyl acetate. The organic layer waswashed with water and brine, and dried over anhydrous sodium sulfate.The solvent was removed and the residue was dissolved in ethanol (2 mL),and hydrogen chloride (2 M ethanol solution, 0.359 mL) was added to themixture. The reaction mixture was stirred at room temperature for 2days. The precipitates were collected on a filter to afford the titlecompound as a pale yellow solid (83 mg).

¹H-NMR (DMSO-d6) δ: 1.10 (3H, d, J=7.3 Hz), 1.18 (3H, d, J=6.1 Hz), 2.03(3H, s), 2.27 (1H, d, J=16.9 Hz), 2.76 (1H, dd, J=16.9, 6.6 Hz),3.47-3.57 (1H, m), 3.76-3.83 (1H, m), 3.86-3.92 (1H, m), 3.92-4.02 (1H,m), 4.86 (1H, brs), 6.57 (1H, d, J=9.0 Hz), 7.42 (1H, d, J=9.0 Hz),11.03 (1H, s), 12.46 (1H, s).

The following compound was prepared from the appropriate startingmaterial in a similar manner to Example 74.

Example 756-[3-Chloro-2-hydroxy-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.11 (3H, d, J=7.3 Hz), 1.19 (3H, d, J=5.9 Hz),2.26-2.34 (1H, m), 2.80 (1H, dd, J=16.7, 6.7 Hz), 3.50-3.60 (1H, m),3.83-3.93 (1H, m), 3.94-4.05 (2H, m), 4.87-4.94 (1H, m), 6.74 (1H, d,J=9.0 Hz), 7.55 (1H, d, J=9.0 Hz), 11.13 (1H, s), 13.01 (1H, s).

Example 76 Production of6-{3-chloro-2-fluoro-4-[(Z)-4-hydroxy-2-butenyloxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of6-{4-[(Z)-4-(tert-butyldimethylsilyloxy)-2-butenyloxy]-3-chloro-2-fluorophenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 144, 296 mg) in THF (5 mL) was addedtetrabutylammonium fluoride (1.0 M THF solution, 0.805 mL), and then themixture was stirred at room temperature overnight. The reaction mixturewas concentrated, and the obtained crude product was purified by silicagel column chromatography (heptane:ethyl acetate=10:90 to 0:100). Theobtained solid was washed by trituration with diisopropyl ether, andthen collected on a filter to afford the title compound as a white solid(135 mg).

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.1 Hz), 2.25 (1H, dd, J=16.9, 3.4Hz), 2.69 (1H, dd, J=16.9, 6.8 Hz), 3.09-3.21 (1H, m), 4.11 (2H, t,J=5.0 Hz), 4.78-4.89 (3H, m), 5.59-5.70 (1H, m), 5.73-5.83 (1H, m), 7.09(1H, dd, J=9.0, 1.2 Hz), 7.54 (1H, t, J=9.0 Hz), 11.03 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 76.

Example 776-[3-Chloro-2-hydroxy-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Melting point: 225.0-225.3° C.

Example 786-[2-Hydroxy-4-(3-hydroxypropoxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Melting point: 199.1-200.1° C.

Example 796-[3-Chloro-4-(4-hydroxybutoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.24 (3H, d, J=7.6 Hz), 1.57 (1H, t, J=5.4 Hz),1.78-1.98 (4H, m), 2.34 (3H, s), 2.43-2.51 (1H, m), 2.68 (1H, dd,J=16.9, 6.8 Hz), 3.23-3.34 (1H, m), 3.76 (2H, q, J=6.1 Hz), 3.98 (2H, t,J=6.1 Hz), 7.47 (1H, dd, J=2.2, 0.7 Hz), 7.58-7.62 (1H, m), 8.63 (1H s).

Example 806-[3-Bromo-5-fluoro-4-(4-hydroxybutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.24 (3H, d, J=7.3 Hz), 1.42 (1H, t, J=5.5 Hz),1.77-1.87 (2H, m), 1.88-1.97 (2H, m), 2.48 (1H, dd, J=17.0, 0.9 Hz),2.70 (1H, dd, J=17.0, 6.8 Hz), 3.19-3.32 (1H, m), 3.76 (2H, q, J=5.5Hz), 4.21 (2H, td, J=6.1, 1.2 Hz), 7.48 (1H, dd, J=12.3, 2.1 Hz), 7.70(1H, t, J=2.1 Hz), 8.53 (1H, brs).

Example 816-[3,5-Dichloro-4-(4-hydroxybutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.25 (3H, d, J=7.3 Hz), 1.47 (1H, t, J=5.5 Hz),1.79-1.90 (2H, m), 1.92-2.02 (2H, m), 2.49 (1H, dd, J=17.1, 1.0 Hz),2.70 (1H, dd, J=17.1, 6.8 Hz), 3.17-3.33 (1H, m), 3.77 (2H, q, J=5.5Hz), 4.10 (2H, t, J=6.2 Hz), 7.69 (2H, s), 8.58 (1H, brs).

Example 826-[2,3-Difluoro-4-(4-hydroxybutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.22 (3H, d, J=7.1 Hz), 1.44 (1H, t, J=5.4 Hz),1.72-1.84 (2H, m), 1.90-2.00 (2H, m), 2.45 (1H, dd, J=17.0, 3.1 Hz),2.74 (1H, dd, J=17.0, 6.7 Hz), 3.21-3.33 (1H, m), 3.75 (2H, q, J=5.4Hz), 4.13 (2H, t, J=6.2 Hz), 6.74-6.84 (1H, m), 7.27-7.35 (1H, m), 8.51(1H, brs).

Example 836-[2-Fluoro-4-(4-hydroxybutoxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.20 (3H, d, J=7.1 Hz), 1.41 (1H, t, J=5.4 Hz),1.73-1.84 (2H, m), 1.85-2.00 (2H, m), 2.15 (3H, d, J=2.4 Hz), 2.42 (1H,dd, J=17.0, 3.3 Hz), 2.74 (1H, dd, J=17.0, 6.7 Hz), 3.22-3.33 (1H, m),3.75 (2H, q, J=5.4 Hz), 4.05 (2H, t, J=6.1 Hz), 6.66 (1H, d, J=8.8 Hz),7.35 (1H, t, J=8.8 Hz), 8.46 (1H, brs).

Example 846-[3-Chloro-2-fluoro-4-(4-hydroxybutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.21 (3H, d, J=7.3 Hz), 1.48 (1H, t, J=5.5 Hz),1.76-1.85 (2H, m), 1.93-2.02 (2H, m), 2.44 (1H, dd, J=17.0, 3.3 Hz),2.74 (1H, dd, J=17.0, 6.7 Hz), 3.17-3.34 (1H, m), 3.76 (2H, q, J=5.5Hz), 4.14 (2H, t, J=6.1 Hz), 6.77 (1H, dd, J=8.9, 1.3 Hz), 7.46 (1H, t,J=8.9 Hz), 8.53 (1H, brs).

Example 856-[2-Fluoro-4-(3-hydroxypropoxy)-3-vinylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.19 (3H, d, J=6.8 Hz), 1.70 (1H, t, J=5.1 Hz), 2.10(2H, quintet, J=6.1 Hz), 2.42 (1H, dd, J=17.1, 3.7 Hz), 2.73 (1H, dd,J=17.1, 6.8 Hz), 3.21-3.33 (1H, m), 3.86-3.91 (2H, m), 4.20 (2H, t,J=6.1 Hz), 5.52-5.59 (1H, m), 5.98-6.06 (1H, m), 6.74 (1H, dd, J=8.8,0.5 Hz), 6.78 (1H, dd, J=18.1, 12.0 Hz), 7.39 (1H, t, J=8.8 Hz), 8.62(1H, brs).

Example 866-{3-Chloro-4-[(Z)-4-hydroxy-2-butenyloxy]-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 2.23 (1H, d, J=16.7 Hz),2.31 (3H, s), 2.67 (1H, dd, J=16.7, 7.0 Hz), 3.33-3.43 (1H, m),4.00-4.04 (2H, m), 4.53-4.56 (2H, m), 4.77 (1H, t, J=5.4 Hz), 5.69-5.78(2H, m), 7.61 (1H, dd, J=2.2, 0.7 Hz), 7.67 (1H, d, J=2.2 Hz), 10.99(1H, s).

Example 876-[2-Hydroxy-4-(4-hydroxybutoxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Melting point: 178.7-179.9° C.

Example 886-[3-Chloro-2-hydroxy-4-(4-hydroxybutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Melting point: 204.5-204.9° C.

Example 896-[2-Fluoro-4-(4-hydroxybutoxy)-3-vinylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Melting point: 106.4-107.4° C.

Example 906-[3-Chloro-2-fluoro-4-[(E)-4-hydroxy-2-butenyloxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.1 Hz), 2.25 (1H, dd, J=16.9, 3.7Hz), 2.69 (1H, dd, J=16.9, 6.7 Hz), 3.11-3.19 (1H, m), 3.98-4.02 (2H,m), 4.73 (2H, dd, J=5.6, 1.2 Hz), 4.83 (1H, t, J=5.5 Hz), 5.81-5.89 (1H,m), 5.96-6.04 (1H, m), 7.10 (1H, dd, J=9.0, 1.2 Hz), 7.54 (1H, dd,J=9.0, 8.8 Hz), 11.02 (1H, brs).

Example 916-[3-Chloro-2-fluoro-4-(5-hydroxypentoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.20 (3H, dd, J=7.3, 0.5 Hz), 1.38 (1H, t, J=5.1 Hz),1.54-1.72 (4H, m), 1.85-1.96 (2H, m), 2.43 (1H, dd, J=16.9, 3.2 Hz),2.73 (1H, dd, J=16.9, 6.6 Hz), 3.21-3.33 (1H, m), 3.66-3.74 (2H, m),4.10 (2H, t, J=6.4 Hz), 6.75 (1H, dd, J=9.0, 1.5 Hz), 7.42-7.50 (1H, m),8.66 (1H, brs).

Example 926-[2-Fluoro-4-[(Z)-4-hydroxy-2-butenyloxy]-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.3 Hz), 2.09 (3H, d, J=2.2 Hz), 2.23(1H, dd, J=16.7, 3.7 Hz), 2.66 (1H, dd, J=16.7, 6.7 Hz), 3.06-3.18 (1H,m), 4.10 (2H, t, J=5.3 Hz), 4.71 (2H, d, J=5.6 Hz), 4.82 (1H, t, J=5.3Hz), 5.59-5.69 (1H, m), 5.70-5.80 (1H, m), 6.88 (1H, d, J=8.9 Hz), 7.37(1H, t, J=8.9 Hz), 10.92 (1H, s).

Example 936-{2,3-Difluoro-4-[(Z)-4-hydroxy-2-butenyloxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.1 Hz), 2.25 (1H, dd, J=16.9, 3.4Hz), 2.70 (1H, dd, J=16.9, 6.8 Hz), 3.09-3.23 (1H, m), 4.08-4.13 (2H,m), 4.80 (2H, d, J=6.1 Hz), 4.84 (1H, t, J=5.4 Hz), 5.59-5.70 (1H, m),5.72-5.82 (1H, m), 7.05-7.15 (1H, m), 7.34-7.43 (1H, m), 11.03 (1H, s).

Example 946-{3-Chloro-5-fluoro-4-[(Z)-4-hydroxy-2-butenyloxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.1 Hz), 2.24 (1H, d, J=16.7 Hz),2.69 (1H, dd, J=16.7, 7.0 Hz), 3.35-3.46 (1H, m), 3.96-4.03 (2H, m),4.71-4.83 (3H, m), 5.61-5.81 (2H, m), 7.64 (1H, dd, J=12.3, 2.1 Hz),7.69 (1H, t, J=2.1 Hz), 11.07 (1H, s).

Example 956-{3-Bromo-5-fluoro-4-[(Z)-4-hydroxy-2-butenyloxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 2.23 (1H, d, J=16.9 Hz),2.69 (1H, dd, J=16.9, 6.8 Hz), 3.34-3.46 (1H, m), 3.96-4.07 (2H, m),4.68-4.84 (3H, m), 5.60-5.81 (2H, m), 7.67 (1H, dd, J=12.5, 2.2 Hz),7.82 (1H, t, J=2.2 Hz), 11.07 (1H, s).

Example 966-{2-Fluoro-4-[(Z)-4-hydroxy-2-butenyloxy]-3-vinylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.19 (3H, d, J=7.3 Hz), 1.68 (1H, t, J=5.6 Hz), 2.42(1H, dd, J=17.1, 3.7 Hz), 2.73 (1H, dd, J=17.1, 6.8 Hz), 3.20-3.34 (1H,m), 4.30 (2H, t, J=5.1 Hz), 4.72 (2H, d, J=5.1 Hz), 5.51-5.59 (1H, m),5.79-5.95 (2H, m), 5.99-6.09 (1H, m), 6.72 (1H, d, J=8.8 Hz), 6.80 (1H,dd, J=18.1, 12.2 Hz), 7.39 (1H, t, J=8.8 Hz), 8.62 (1H, brs).

Example 976-[3-Ethyl-2-fluoro-4-(4-hydroxybutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.14 (3H, t, J=7.6 Hz), 1.20 (3H, d, J=7.3 Hz), 1.38(1H, t, J=5.4 Hz), 1.73-1.84 (2H, m), 1.87-1.98 (2H, m), 2.41 (1H, dd,J=17.1, 3.4 Hz), 2.64-2.78 (3H, m), 3.21-3.34 (1H, m), 3.71-3.79 (2H,m), 4.05 (2H, t, J=6.4 Hz), 6.67 (1H, d, J=8.8 Hz), 7.35 (1H, t, J=8.8Hz), 8.47 (1H, brs).

Example 98 Production of6-[3-chloro-4-(4-hydroxy-2,2-dimethylbutoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of6-(3-chloro-4-hydroxy-5-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 86, 255 mg),4-(tert-butyldimethylsilyloxy)-2,2-dimethylbutan-1-ol (258 mg), andtriphenylphosphine (291 mg) in THF (10 mL) was added bis(2-methoxyethyl)azodicarboxylate (260 mg) at 0° C., and then the mixture was stirred atroom temperature overnight. The solvent was removed, and then theresidue was purified by silica gel column chromatography (heptane:ethylacetate=50:50) to afford a pale yellow solid (165 mg). The obtainedsolid was dissolved in THF (5 mL). To the solution was addedtetrabutylammonium fluoride (1.0 M THF solution, 0.424 mL) at 0° C., andthen the solution was stirred at 50° C. for 2 hours. To the reactionmixture was added water, and the mixture was extracted with ethylacetate. The organic layer was washed with brine, dried over anhydroussodium sulfate, and filtrated, and the solvent was removed. The obtainedcrude product was purified by silica gel column chromatography (heptane: ethyl acetate=50:50 to 0:100), and the desired fractions wereconcentrated. The residue was crystallized from diisopropyl ether/ethylacetate, and the precipitates were collected on a filter to afford thetitle compound as a white powder (59 mg).

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 1.06 (6H, s), 1.60 (2H, t,J=7.3 Hz), 2.22 (1H, d, J=16.5 Hz), 2.31 (3H, s), 2.67 (1H, dd, J=16.5,7.0 Hz), 3.34-3.42 (1H, m), 3.52-3.59 (2H, m), 3.58 (2H, s), 4.32 (1H,t, J=5.0 Hz), 7.59-7.61 (1H, m), 7.65-7.67 (1H, m), 10.98 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 98.

Example 996-[3-Chloro-5-fluoro-4-(4-hydroxy-2,2-dimethylbutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (6H, s), 1.04 (3H, d, J=7.6 Hz), 1.57 (2H, t,J=7.3 Hz), 2.23 (1H, d, J=16.7 Hz), 2.69 (1H, dd, J=16.7, 7.0 Hz),3.35-3.46 (1H, m), 3.52 (2H, t, J=7.3 Hz), 3.83 (2H, d, J=1.5 Hz), 4.32(1H, brs), 7.64 (1H, dd, J=12.6, 2.1 Hz), 7.68 (1H, t, J=2.1 Hz), 11.06(1H, s).

Example 1006-[3,5-Dichloro-4-(4-hydroxy-2,2-dimethylbutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.1 Hz), 1.07 (6H, s), 1.60 (2H, t,J=7.3 Hz), 2.23 (1H, d, J=16.7 Hz), 2.69 (1H, dd, J=16.7, 7.0 Hz),3.36-3.47 (1H, m), 3.55 (2H, t, J=7.3 Hz), 3.71 (2H, s), 4.19-4.45 (1H,m), 7.82 (2H, s), 11.08 (1H, s).

Example 1016-[3-Fluoro-4-(4-hydroxy-2,2-dimethylbutoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.02 (6H, s), 1.05 (3H, d, J=7.3 Hz), 1.57 (2H, t,J=7.3 Hz), 2.22 (1H, d, J=16.6 Hz), 2.28 (3H, s), 2.66 (1H, dd, J=16.6,6.8 Hz), 3.27-3.42 (1H, m), 3.48-3.57 (2H, m), 3.72 (2H, d, J=1.5 Hz),4.32 (1H, t, J=5.0 Hz), 7.40-7.48 (2H, m), 10.95 (1H, s).

Example 1026-[2,3-Difluoro-4-(4-hydroxy-2,2-dimethylbutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.00 (6H, s), 1.05 (3H, d, J=7.3 Hz), 1.55 (2H, t,J=7.3 Hz), 2.25 (1H, dd, J=16.9, 3.4 Hz), 2.70 (1H, dd, J=16.9, 6.8 Hz),3.09-3.22 (1H, m), 3.51 (2H, t, J=7.3 Hz), 3.82 (2H, s), 4.34 (1H, brs),7.02-7.12 (1H, m), 7.38 (1H, td, J=8.7, 2.2 Hz), 11.02 (1H, s).

Example 1036-[3-Chloro-2-fluoro-4-(4-hydroxy-2,2-dimethylbutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (6H, s), 1.04 (3H, d, J=7.3 Hz), 1.57 (2H, t,J=7.4 Hz), 2.25 (1H, dd, J=16.9, 3.7 Hz), 2.69 (1H, dd, J=16.9, 6.7 Hz),3.07-3.22 (1H, m), 3.51 (2H, t, J=7.4 Hz), 3.83 (2H, s), 4.34 (1H, brs),7.05 (1H, dd, J=9.0, 1.2 Hz), 7.53 (1H, t, J=9.0 Hz), 11.01 (1H, s).

Example 104 Production of2-fluoro-6-(2-hydroxypropoxy)-3-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)benzonitrile

A mixture of6-[3-bromo-2-fluoro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Example 48, 180 mg), zinc cyanide (105 mg), andtetrakis(triphenylphosphine)palladium (29 mg) in DMF (2.5 mL) wasstirred at 150° C. under microwave irradiation for 30 minutes. To thereaction mixture were added ethyl acetate and water, and then themixture was filtered through a Celite pad. The organic layer wasseparated, washed with brine, dried with anhydrous sodium sulfate,filtrated, and then concentrated. The obtained crude product waspurified by silica gel column chromatography (heptane:ethylacetate=40:60 to 0:100), and the desired fractions were concentrated.The residue was crystallized from diisopropyl ether. The precipitateswere collected on a filter to afford the title compound as a white solid(93 mg).

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 1.18 (3H, d, J=6.2 Hz), 2.26(1H, dd, J=16.9, 3.4 Hz), 2.71 (1H, dd, J=16.9, 6.8 Hz), 3.11-3.22 (1H,m), 3.95-4.14 (3H, m), 4.99 (1H, d, J=4.8 Hz), 7.21 (1H, d, J=9.0 Hz),7.90 (1H, t, J=9.0 Hz), 11.09 (1H, s).

The following compound was prepared from the appropriate startingmaterial in a similar manner to Example 104.

Example 1052-Fluoro-6-(2-hydroxy-2-methylpropoxy)-3-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)benzonitrile

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.1 Hz), 1.23 (6H, s), 2.26 (1H, dd,J=16.9, 3.4 Hz), 2.71 (1H, dd, J=16.9, 6.8 Hz), 3.12-3.22 (1H, m), 3.97(2H, s), 4.77 (1H, s), 7.21 (1H, d, J=9.0 Hz), 7.90 (1H, t, J=9.0 Hz),11.09 (1H, s).

Example 106 Production of2-fluoro-6-(3-hydroxypropoxy)-3-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)benzonitrile

A mixture of6-[3-bromo-2-fluoro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Example 12, 150 mg), zinc cyanide (108 mg), andtetrakis(triphenylphosphine)palladium (24 mg) in DMF (1.5 mL) wasstirred at 100° C. overnight. The reaction mixture was allowed to coolto room temperature, and then tetrakis(triphenylphosphine)palladium (97mg) was added thereto. The reaction mixture was stirred at 100° C.further for one day. The reaction mixture was allowed to cool to roomtemperature, water and ethyl acetate were added to the reaction mixture,and then the mixture was filtered through a Celite pad. The organiclayer of the filtrate was separated, washed with water and brine, driedwith anhydrous sodium sulfate, filtrated, and then concentrated toafford a solid (191 mg). The solid was dissolved in DMF (2.0 mL),imidazole (34 mg) and tert-butyldimethylchlorosilane (69 mg) were addedto the mixture, and the mixture was stirred at room temperatureovernight. Imidazole (34 mg) and tert-butyldimethylchlorosilane (69 mg)were further added thereto, and the mixture was stirred at roomtemperature for 30 minutes. To the reaction mixture was added water, andthe mixture was extracted with ethyl acetate. The organic layer waswashed with water and brine, dried over anhydrous sodium sulfate, andfiltrated, and the solvent was removed. The obtained crude product waspurified by silica gel column chromatography (heptane:ethylacetate=85:15 to 15:85) to afford a white solid (45 mg). To a solutionof the obtained white solid (45 mg) in THF (1.0 mL) under ice-cold wasadded tetrabutylammonium fluoride (1.0 M THF solution, 0.16 mL). Themixture was stirred at room temperature for one hour. To the reactionmixture were added water and brine, and the mixture was extracted withethyl acetate. The organic layer was dried over anhydrous sodiumsulfate, and filtrated, and the solvent was removed. The obtained crudeproduct was purified by silica gel column chromatography (heptane:ethylacetate=10:90 to 0:100 to ethyl acetate:methanol=90:10). The obtainedsolid was washed by trituration with diisopropyl ether, and thencollected on a filter to afford the title compound as a white solid (26mg).

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.0 Hz), 1.86-1.96 (2H, m), 2.26 (1H,d, J=16.9 Hz), 2.70 (1H, dd, J=16.9, 6.5 Hz), 3.12-3.22 (1H, m),3.53-3.64 (2H, m), 4.25-4.33 (2H, m), 4.58-4.66 (1H, m), 7.20 (1H, d,J=8.9 Hz), 7.92 (1H, t, J=8.9 Hz), 11.09 (1H, s).

Example 107 Production of6-[4-(2,2-difluoro-3-hydroxypropoxy)-2-fluoro-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of2,2-difluoro-3-[3-fluoro-2-methyl-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]propylbenzoate (Reference example 166, 253 mg) in methanol (2 mL) was added 5M aqueous sodium hydroxide (0.349 mL), and the mixture was stirred atroom temperature for 2 hours. To the reaction mixture was added water,and the mixture was extracted with ethyl acetate. The organic layer waswashed with water and brine, dried over anhydrous sodium sulfate, andfiltrated, and the solvent was removed. The obtained crude solid wasrecrystallized from heptane/ethyl acetate to afford the title compoundas a white solid (117 mg).

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.1 Hz), 2.11 (3H, d, J=2.2 Hz), 2.23(1H, dd, J=16.7, 3.8 Hz), 2.67 (1H, dd, J=16.7, 6.7 Hz), 3.06-3.20 (1H,m), 3.71-3.87 (2H, m), 4.39 (2H, t, J=12.6 Hz), 5.65-5.73 (1H, m), 6.97(1H, d, J=8.8 Hz), 7.40 (1H, t, J=8.8 Hz), 10.95 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 107.

Example 1086-[4-(2,2-Difluoro-3-hydroxypropoxy)-2,3-difluorophenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 2.25 (1H, dd, J=16.8, 3.4Hz), 2.71 (1H, dd, J=16.8, 6.8 Hz), 3.12-3.23 (1H, m), 3.76 (2H, td,J=13.7, 6.3 Hz), 4.51 (2H, t, J=12.8 Hz), 5.71 (1H, t, J=6.3 Hz),7.15-7.24 (1H, m), 7.38-7.46 (1H, m), 11.06 (1H, s).

Example 1096-[3,5-Dichloro-4-(2,2-difluoro-3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 2.24 (1H, d, J=16.9 Hz),2.70 (1H, dd, J=16.9, 6.8 Hz), 3.37-3.49 (1H, m), 3.82 (2H, td, J=13.9,6.1 Hz), 4.38 (2H, t, J=13.2 Hz), 5.65 (1H, t, J=6.1 Hz), 7.85 (2H, s),11.11 (1H, s).

Example 1106-[3-Chloro-4-(2,2-difluoro-3-hydroxypropoxy)-2-fluorophenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.1 Hz), 2.25 (1H, dd, J=16.9, 3.8Hz), 2.70 (1H, dd, J=16.9, 6.8 Hz), 3.09-3.22 (1H, m), 3.80 (2H, td,J=13.7, 6.2 Hz), 4.51 (2H, t, J=12.6 Hz), 5.70 (1H, t, J=6.2 Hz), 7.19(1H, dd, J=9.0, 1.5 Hz), 7.53-7.61 (1H, m), 11.04 (1H, s).

Example 1116-[3-Chloro-4-(2,2-difluoro-3-hydroxypropoxy)-5-fluorophenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 2.24 (1H, d, J=16.9 Hz),2.69 (1H, dd, J=16.9, 7.1 Hz), 3.36-3.47 (1H, m), 3.80 (2H, td, J=13.8,6.1 Hz), 4.47 (2H, t, J=13.1 Hz), 5.65 (1H, t, J=6.1 Hz), 7.63-7.74 (2H,m), 11.09 (1H, s).

Example 1126-[3-Bromo-4-(2,2-difluoro-3-hydroxypropoxy)-2-fluorophenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.1 Hz), 2.25 (1H, dd, J=16.9, 3.7Hz), 2.70 (1H, dd, J=16.9, 6.8 Hz), 3.08-3.21 (1H, m), 3.82 (2H, td,J=13.8, 6.2 Hz), 4.50 (2H, t, J=12.3 Hz), 5.70 (1H, t, J=6.2 Hz), 7.15(1H, dd, J=8.8, 1.2 Hz), 7.60 (1H, t, J=8.8 Hz), 11.04 (1H, s).

Example 1136-[3-Chloro-4-(2,2-difluoro-3-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 2.23 (1H, d, J=16.7 Hz),2.33 (3H, s), 2.68 (1H, dd, J=16.7, 7.0 Hz), 3.33-3.45 (1H, m), 3.81(2H, td, J=13.9, 6.0 Hz), 4.27 (2H, t, J=13.4 Hz), 5.65 (1H, t, J=6.0Hz), 7.62 (1H, d, J=2.2 Hz), 7.68 (1H, d, J=2.2 Hz), 11.00 (1H, s).

Example 1146-[4-(2,2-Difluoro-3-hydroxypropoxy)-2-fluoro-3-vinylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (CDCl₃) δ: 1.19 (3H, d, J=7.1 Hz), 2.13 (1H, t, J=7.1 Hz), 2.42(1H, dd, J=17.1, 3.7 Hz), 2.73 (1H, dd, J=17.1, 6.8 Hz), 3.20-3.31 (1H,m), 4.00 (2H, td, J=12.5, 7.1 Hz), 4.34 (2H, t, J=11.5 Hz), 5.56-5.63(1H, m), 5.98-6.06 (1H, m), 6.70-6.83 (2H, m), 7.41 (1H, t, J=8.5 Hz),8.57 (1H, brs).

Example 115 Production of6-[4-(2,2-difluoro-3-hydroxypropoxy)-2-hydroxy-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

A mixture of2,2-difluoro-3-[3-(methoxymethyloxy)-2-methyl-4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenoxy]propylmethanesulfonate (Reference example 141, 80 mg) and sodium benzoate (51mg) in DMF (2 mL) was stirred at 180° C. under microwave irradiation for30 minutes. The reaction mixture was poured into water, and the mixturewas extracted with ethyl acetate. The organic layer was washed withwater and brine, dried over anhydrous sodium sulfate, and filtrated, andthe solvent was removed. The obtained crude product was purified bysilica gel column chromatography (heptane:ethyl acetate=50:50) to afforda colorless oil. The oil was dissolved in ethanol (2 mL), 5 M aqueoussodium hydroxide (0.046 mL) was added thereto, and the mixture wasstirred at room temperature for one hour. The mixture was poured intowater, and the mixture was extracted with ethyl acetate. The organiclayer was washed with water and brine, and dried over anhydrous sodiumsulfate, filtrated, and concentrated. The residue was dissolved inethanol (2 mL), hydrogen chloride (2 M ethanol solution, 0.058 mL) wasadded thereto, and the mixture was stirred at room temperatureovernight. The precipitates were collected on a filter to afford thetitle compound as a white solid (20 mg).

¹H-NMR (DMSO-d6) δ: 1.10 (3H, d, J=7.3 Hz), 2.04 (3H, s), 2.27 (1H, d,J=16.6 Hz), 2.77 (1H, dd, J=16.7, 6.7 Hz), 3.47-3.61 (1H, m), 3.73-3.86(2H, m), 4.35 (2H, t, J=12.7 Hz), 5.66 (1H, t, J=6.2 Hz), 6.66 (1H, d,J=9.0 Hz), 7.46 (1H, d, J=9.0 Hz), 11.06 (1H, s), 12.54 (1H, s).

Example 116 Production of(5R)-(−)-6-[3-chloro-4-(2-hydroxyethoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of2-{2-chloro-6-methyl-4-[(2R)-2-methyl-3-{[(1S)-1-(4-nitrophenyl)ethyl]carbamoyl}propanoyl]phenoxy}ethyl4-bromobenzoate (Reference example 175, 300 mg) in 2-propanol (5.0 mL)were added acetic acid (0.272 mL) and hydrazine monohydrate (0.115 mL),and then the mixture was stirred at 60° C. overnight. The reactionmixture was concentrated, water was added to the residue, and themixture was extracted with ethyl acetate. The organic layer was washedwith water and brine, dried over anhydrous sodium sulfate, andfiltrated, and the solvent was removed. The residue was purified bysilica gel column chromatography (heptane:ethyl acetate=80:20 to 50:50).The obtained solid was washed by trituration with ethyl acetate/heptane,and then collected on a filter to afford a colorless solid (168 mg). Thesolid was dissolved in ethanol (5.0 mL), and 5 M aqueous sodiumhydroxide (0.140 mL) was added to the mixture. The mixture was stirredat room temperature for 15 minutes, water was added to the solution, andthe mixture was extracted with ethyl acetate. The organic layer waswashed with water and brine, dried over anhydrous sodium sulfate, andfiltrated, and the solvent was removed. The obtained crude product waspurified by silica gel column chromatography (heptane:ethylacetate=25:75 to 0:100). The obtained solid was recrystallized fromethyl acetate/heptane to afford the title compound as a colorless solid(50 mg, >99% ee). The optical purity was determined by high performanceliquid chromatography (HPLC) analysis.

Optical rotation: [α]_(D) ²⁴ −322.4° (c=0.21, MeOH)

¹H-NMR (CDCl₃) δ: 1.24 (3H, d, J=7.3 Hz), 2.28 (1H, t, J=6.4 Hz), 2.37(3H, s), 2.44-2.52 (1H, m), 2.69 (1H, dd, J=16.9, 6.8 Hz), 3.23-3.34(1H, m), 3.94-4.01 (2H, m), 4.03-4.13 (2H, m), 7.49-7.50 (1H, m), 7.62(1H, d, J=2.0 Hz), 8.59 (1H, brs).

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK IA column (0.46 cmφ×25 cm)

Eluent: hexane/ethanol=60/40

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 7.22 min (>99% ee).

Each absolute configuration of Examples 117-127 shown below wasextrapolated by comparison with Example 116.

Example 117(5R)-(−)-6-[3,5-Difluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

6-[3,5-Difluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Example 30, 267 mg) was optically-resolved by chiral columnchromatography according to the following preparative condition, andthen recrystallized from heptane/ethanol to afford the title compound asa white solid (33 mg, 99% ee).

<Preparative Condition>

Column: Daicel CHIRALFLASH IA (3.0 cmφ×10 cm)

Eluent: hexane/ethanol=60/40

Flow rate: 12 ml/min

Detection: UV (254 nm).

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK AS-RH (0.46 cmφ×15 cm)

Eluent: acetonitrile/water=50/50

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 4.6 min

[α]_(D) ²⁴ −306.4° (c=0.25, MeOH)

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 1.20 (6H, s), 2.23 (1H, d,J=16.7 Hz), 2.68 (1H, dd, J=16.7, 7.0 Hz), 3.34-3.44 (1H, m), 3.89 (2H,s), 4.62 (1H, s), 7.43-7.60 (2H, m), 11.05 (1H, s).

Example 118 Production of(5R)-(−)-6-[3-chloro-2-fluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

6-[3-Chloro-2-fluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Example 29, 200 mg) was optically-resolved by chiral columnchromatography according to the following preparative condition, andthen recrystallized from 2-propanol to afford the title compound as awhite solid (46 mg, 95% ee).

<Preparative Condition>

Column: Daicel CHIRALFLASH IA (3.0 cmφ×10 cm)

Eluent: hexane/ethanol=70/30

Flow rate: 12 ml/min

Detection: UV (254 nm).

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK IA (0.46 cmφ×25 cm)

Eluent: hexane/ethanol=30/70

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 5.2 min

Optical rotation: [α]_(D) ²⁴ −123.0° (c=0.28, MeOH)

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 1.24 (6H, s), 2.25 (1H, dd,J=16.8, 3.5 Hz), 2.70 (1H, dd, J=16.8, 6.8 Hz), 3.09-3.20 (1H, m), 3.87(2H, s), 4.69 (1H, s), 7.08 (1H, dd, J=9.0, 1.3 Hz), 7.49-7.58 (1H, m),11.01 (1H, s).

The following compound was prepared from the appropriate startingmaterial in a similar manner to Example 118.

Example 119 Production of(5R)-(−)-6-{3-chloro-5-fluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Optical purity: >99% ee

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK IA (0.46 cmφ×25 cm)

Eluent: hexane/ethanol=40/60

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 6.0 min

Optical rotation: [α]_(D) ²⁴ −274.6° (c=0.31, MeOH)

¹H-NMR (DMSO-d6) δ: 0.61-0.73 (4H, m), 1.04 (3H, d, J=7.3 Hz), 2.23 (1H,d, J=16.7 Hz), 2.69 (1H, dd, J=16.7, 6.7 Hz), 3.34-3.47 (1H, m), 4.10(2H, s), 5.54 (1H, s), 7.58-7.72 (2H, m), 11.06 (1H, s).

Example 120 Production of(5R)-(−)-6-[4-(2,2-difluoro-3-hydroxypropoxy)-2-fluoro-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

6-[4-(2,2-Difluoro-3-hydroxypropoxy)-2-fluoro-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Example 107, 130 mg) was optically-resolved by chiral columnchromatography according to the following preparative condition, andthen recrystallized from ethyl acetate/heptane to afford the titlecompound as a white solid (33 mg, 99% ee).

<Preparative Condition>

Column: Daicel CHIRALFLASH IA (3.0 cmφ×10 cm)

Eluent: hexane/ethanol=75/25

Flow rate: 12 ml/min

Detection: UV (254 nm).

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK IA (0.46 cmφ×25 cm)

Eluent: hexane/ethanol=50/50

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 5.7 min

Optical rotation: [α]_(D) ²⁷ −101.5° (c=0.29, MeOH)

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.1 Hz), 2.11 (3H, d, J=2.2 Hz), 2.23(1H, dd, J=16.7, 3.8 Hz), 2.67 (1H, dd, J=16.7, 6.7 Hz), 3.05-3.18 (1H,m), 3.79 (2H, td, J=13.7, 6.0 Hz), 4.39 (2H, t, J=12.6 Hz), 5.68 (1H, t,J=6.0 Hz), 6.97 (1H, d, J=8.8 Hz), 7.40 (1H, t, J=8.8 Hz), 10.95 (1H,s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 120.

Example 121(5R)-(−)-6-[3,5-Difluoro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Optical purity: 95% ee

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK IA (0.46 cmφ×25 cm)

Eluent: hexane/ethanol=60/40

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 6.9 min

[α]_(D) ²⁴ −293.5° (c=0.30, MeOH)

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 1.76-1.90 (2H, m), 2.24 (1H,d, J=16.7 Hz), 2.68 (1H, dd, J=16.7, 7.0 Hz), 3.36-3.46 (1H, m),3.52-3.60 (2H, m), 4.23 (2H, t, J=6.3 Hz), 4.53 (1H, t, J=5.1 Hz),7.44-7.59 (2H, m), 11.05 (1H, s).

Example 122(5R)-(−)-6-[3-Chloro-2-fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Optical purity: 96% ee

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK IA (0.46 cmφ×25 cm)

Eluent: hexane/ethanol=60/40

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 7.2 min

[α]_(D) ²⁴ −114.2° (c=0.28, MeOH)

¹H-NMR (DMSO-d6) δ: 0.96 (6H, s), 1.04 (3H, d, J=7.2 Hz), 2.25 (1H, dd,J=16.8, 3.6 Hz), 2.70 (1H, dd, J=16.8, 6.7 Hz), 3.09-3.20 (1H, m),3.29-3.34 (2H, m), 3.86 (2H, s), 4.66 (1H, t, J=5.4 Hz), 7.06 (1H, d,J=9.3 Hz), 7.49-7.58 (1H, m), 11.01 (1H, s).

Example 123(5R)-(−)-6-[2,3-Difluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Optical purity: 99% ee

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK IA (0.46 cmφ×25 cm)

Eluent: hexane/ethanol=60/40

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 8.0 min

[α]_(D) ²⁴ −138.7° (c=0.44, MeOH)

¹H-NMR (DMSO-d6) δ: 0.61-0.76 (4H, m), 1.05 (3H, d, J=7.2 Hz), 2.25 (1H,dd, J=16.8, 3.4 Hz), 2.70 (1H, dd, J=16.8, 6.8 Hz), 3.11-3.22 (1H, m),4.12 (2H, s), 5.66 (1H, s), 7.05-7.14 (1H, m), 7.33-7.41 (1H, m), 11.03(1H, s).

Example 124 Production of(5R)-(−)-6-[2,3-difluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

6-[2,3-Difluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Example 27, 117 mg) was optically-resolved by chiral columnchromatography according to the following preparative condition, andthen recrystallized from ethanol/heptane to afford the title compound asa white solid (30 mg, 99% ee).

<Preparative Condition>

Column: Daicel CHIRALFLASH IA (3.0 cmφ×10 cm)

Eluent: hexane/ethanol=80/20

Flow rate: 12 ml/min

Detection: UV (254 nm).

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK AS-RH (0.46 cmφ×15 cm)

Eluent: acetonitrile/water=40/60

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 5.9 min

Optical rotation: [α]_(D) ²⁴ −137.6° (c=0.38, MeOH)

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 1.21 (6H, s), 2.25 (1H, dd,J=16.7, 3.3 Hz), 2.70 (1H, dd, J=16.7, 6.7 Hz), 3.10-3.23 (1H, m), 3.87(2H, s), 4.71 (1H, s), 7.05-7.14 (1H, m), 7.34-7.41 (1H, m), 11.02 (1H,s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 124.

Example 125(5R)-(−)-6-[3-Fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Optical purity: >99% ee

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK IA (0.46 cmφ×25 cm)

Eluent: hexane/ethanol=50/50

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 5.6 min

[α]_(D) ²⁴ −249.7° (c=0.23, MeOH)

¹H-NMR (DMSO-d6) δ: 0.95 (6H, s), 1.05 (3H, d, J=7.3 Hz), 2.22 (1H, d,J=16.9 Hz), 2.28 (3H, s), 2.66 (1H, dd, J=16.9, 6.8 Hz), 3.27-3.42 (1H,m), 3.28-3.33 (2H, m), 3.79 (2H, d, J=1.7 Hz), 4.60 (1H, t, J=5.3 Hz),7.38-7.49 (2H, m), 10.95 (1H, s).

Example 126(5R)-(−)-6-[3-Chloro-2-fluoro-4-(2-hydroxyethoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Optical purity: 98% ee

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK IA (0.46 cmφ×25 cm)

Eluent: hexane/ethanol=60/40

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 8.4 min

[α]_(D) ²⁴ −137.2° (c=0.22, MeOH)

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.25 (1H, dd, J=16.8, 3.7Hz), 2.69 (1H, dd, J=16.8, 6.7 Hz), 3.09-3.20 (1H, m), 3.73-3.79 (2H,m), 4.17 (2H, t, J=4.9 Hz), 4.91 (1H, t, J=5.3 Hz), 7.10 (1H, dd, J=9.0,1.3 Hz), 7.53 (1H, t, J=9.0 Hz), 11.01 (1H, s).

Example 127(5R)-(−)-6-[3-Bromo-5-chloro-4-(3-hydroxy-2,2-dimethylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Optical purity: 97% ee

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK IA (0.46 cmφ×25 cm)

Eluent: hexane/ethanol=60/40

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 5.5 min

[α]_(D) ²⁴ −231.9° (c=0.18, MeOH)

¹H-NMR (DMSO-d6) δ: 1.03 (6H, s), 1.04 (3H, d, J=6.8 Hz), 2.23 (1H, d,J=16.9 Hz), 2.69 (1H, dd, J=16.9, 6.8 Hz), 3.34 (2H, d, J=5.3 Hz),3.37-3.47 (1H, m), 3.77 (2H, s), 4.58 (1H, t, J=5.3 Hz), 7.85 (1H, d,J=2.2 Hz), 7.95 (1H, d, J=2.2 Hz), 11.08 (1H, s).

Example 128 Production of6-[3-chloro-2-hydroxy-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of6-[3-chloro-4-(2-hydroxy-2-methylpropoxy)-2-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 212, 130 mg) in ethanol (2.0 mL) was added hydrogenchloride (2 M ethanol solution, 0.351 mL), and the mixture was stirredat room temperature overnight. The reaction mixture was concentrated,and the residue was washed by trituration with diethyl ether to affordthe title compound as a white solid (100 mg).

¹H-NMR (DMSO-d6) δ: 1.11 (3H, d, J=7.3 Hz), 1.24 (6H, s), 2.25-2.34 (1H,m), 2.81 (1H, dd, J=17.0, 6.7 Hz), 3.48-3.60 (1H, m), 3.83 (2H, s), 4.67(1H, brs), 6.73 (1H, d, J=9.3 Hz), 7.56 (1H, d, J=9.3 Hz), 11.13 (1H,s), 13.01 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 128.

Example 1296-[3-Chloro-2-hydroxy-4-(2-hydroxy-2-methylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.12 (3H, d, J=7.3 Hz), 1.28 (6H, s), 2.24-2.34 (1H,m), 2.26 (3H, s), 2.80 (1H, dd, J=16.9, 6.6 Hz), 3.51-3.61 (1H, m), 3.64(2H, s), 4.63 (1H, s), 7.46 (1H, s), 11.17 (1H, s), 12.78 (1H, s).

Example 1306-[5-Chloro-2-hydroxy-4-(2-hydroxy-2-methylpropoxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.10 (3H, d, J=7.3 Hz), 1.28 (6H, s), 2.15 (3H, s),2.27 (1H, dd, J=16.8, 0.9 Hz), 2.78 (1H, dd, J=16.8, 6.7 Hz), 3.50-3.66(3H, m), 4.66 (1H, s), 7.55 (1H, s), 11.18 (1H, s), 12.60 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 1.

Example 1316-[3-Chloro-2,5-difluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.06 (3H, d, J=7.2 Hz), 1.24 (6H, s), 2.26 (1H, dd,J=16.8, 3.5 Hz), 2.70 (1H, dd, J=16.8, 6.8 Hz), 3.12-3.23 (1H, m),3.91-3.97 (2H, m), 4.66 (1H, s), 7.55 (1H, dd, J=12.3, 7.1 Hz), 11.13(1H, s).

Example 1326-[2-Fluoro-4-(2-hydroxy-2-methylpropoxy)-3,5-dimethylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.3 Hz), 1.27 (6H, s), 2.17 (3H, d,J=2.3 Hz), 2.22 (3H, s), 2.23 (1H, dd, J=16.8, 3.8 Hz), 2.66 (1H, dd,J=16.8, 6.7 Hz), 3.07-3.17 (1H, m), 3.51 (2H, s), 4.65 (1H, s), 7.24(1H, d, J=8.9 Hz), 10.96 (1H, s).

Example 1336-[2-Fluoro-4-(2-hydroxy-2-methylpropoxy)-3-vinylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.6 Hz), 1.23 (6H, s), 2.23 (1H, dd,J=16.9, 4.2 Hz), 2.66 (1H, dd, J=16.9, 6.8 Hz), 3.06-3.18 (1H, m), 3.82(2H, s), 4.71 (1H, s), 5.53-5.60 (1H, m), 6.03-6.11 (1H, m), 6.83 (1H,dd, J=18.1, 12.0 Hz), 6.93 (1H, d, J=8.8 Hz), 7.43 (1H, t, J=8.8 Hz),10.96 (1H, s).

Example 1346-[3-Ethyl-2-fluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.3 Hz), 1.11 (3H, t, J=7.3 Hz), 1.24(6H, s), 2.22 (1H, dd, J=16.9, 3.9 Hz), 2.61-2.71 (3H, m), 3.06-3.18(1H, m), 3.76 (2H, s), 4.68 (1H, s), 6.84 (1H, d, J=9.0 Hz), 7.37 (1H,t, J=9.0 Hz), 10.92 (1H, s).

Example 1356-[2-Fluoro-4-(2-hydroxyethoxy)-3-vinylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.1 Hz), 2.23 (1H, dd, J=16.9, 3.9Hz), 2.66 (1H, dd, J=16.9, 6.8 Hz), 3.06-3.18 (1H, m), 3.72-3.80 (2H,m), 4.10 (2H, t, J=4.6 Hz), 4.91 (1H, t, J=5.6 Hz), 5.54 (1H, dt,J=12.2, 2.0 Hz), 6.06 (1H, dt, J=18.1, 2.0 Hz), 6.80 (1H, dd, J=18.1,12.2 Hz), 6.95 (1H, d, J=8.8 Hz), 7.43 (1H, t, J=8.8 Hz), 10.95 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 5.

Example 1366-[5-Chloro-2-fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.00 (6H, s), 1.04 (3H, d, J=7.2 Hz), 2.20-2.29 (4H,m), 2.68 (1H, dd, J=16.8, 6.8 Hz), 3.09-3.19 (1H, m), 3.34 (2H, d, J=5.2Hz), 3.66 (2H, s), 4.64 (1H, t, J=5.2 Hz), 7.51 (1H, d, J=8.1 Hz), 11.06(1H, s).

Example 1376-[3-Chloro-2-fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.00 (6H, s), 1.04 (3H, d, J=7.2 Hz), 2.21-2.30 (4H,m), 2.69 (1H, dd, J=16.7, 6.7 Hz), 3.09-3.19 (1H, m), 3.34 (2H, d, J=5.2Hz), 3.68 (2H, s), 4.62 (1H, t, J=5.2 Hz), 7.42 (1H, d, J=8.5 Hz), 11.07(1H, s).

Example 1386-[2-Fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)-3,5-dimethylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.99 (6H, s), 1.03 (3H, d, J=7.2 Hz), 2.16 (3H, d,J=2.1 Hz), 2.18-2.27 (1H, m), 2.21 (3H, s), 2.66 (1H, dd, J=16.9, 6.6Hz), 3.06-3.16 (1H, m), 3.35 (2H, d, J=5.1 Hz), 3.50 (2H, s), 4.62 (1H,t, J=5.1 Hz), 7.23 (1H, d, J=9.0 Hz), 10.96 (1H, s).

Example 1396-[3-Chloro-2,5-difluoro-4-(3-hydroxy-2,2-dimethylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.96 (6H, s), 1.05 (3H, d, J=7.2 Hz), 2.26 (1H, dd,J=16.9, 3.5 Hz), 2.70 (1H, dd, J=16.9, 6.8 Hz), 3.12-3.21 (1H, m),3.29-3.33 (2H, m), 3.98-4.00 (2H, m), 4.63 (1H, t, J=5.3 Hz), 7.55 (1H,dd, J=12.5, 7.1 Hz), 11.13 (1H, s).

Example 1406-[3-Chloro-2,5-difluoro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 1.82-1.92 (2H, m), 2.26 (1H,dd, J=16.9, 3.6 Hz), 2.70 (1H, dd, J=16.9, 6.8 Hz), 3.12-3.22 (1H, m),3.55-3.63 (2H, m), 4.24-4.32 (2H, m), 4.55 (1H, t, J=5.1 Hz), 7.56 (1H,dd, J=12.1, 7.1 Hz), 11.14 (1H, s).

Example 1416-[2-Fluoro-4-(3-hydroxypropoxy)-3,5-dimethylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.1 Hz), 1.84-1.94 (2H, m), 2.15 (3H,d, J=2.3 Hz), 2.19-2.27 (1H, m), 2.21 (3H, s), 2.66 (1H, dd, J=16.7, 6.7Hz), 3.06-3.17 (1H, m), 3.58-3.66 (2H, m), 3.85 (2H, t, J=6.3 Hz), 4.53(1H, t, J=5.1 Hz), 7.24 (1H, d, J=8.9 Hz), 10.96 (1H, s).

Example 142 Production of6-[3-chloro-4-(3-hydroxy-2-methylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

A suspension of6-(3-chloro-4-hydroxy-5-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 86, 251 mg), 3-hydroxy-2-methylpropyl4-methylbenzenesulfonate (364 mg), and cesium carbonate (647 mg) in NMP(3.0 mL) was stirred at 150° C. under microwave irradiation for 30minutes. To the reaction mixture was added water, and the mixture wasextracted with ethyl acetate. The organic layer was washed with waterand brine, dried over anhydrous sodium sulfate, and filtrated, and thesolvent was removed. The obtained crude product was purified by silicagel column chromatography (heptane:ethyl acetate=50:50 to 0:100 to ethylacetate:methanol=90:10), and the desired fractions were concentrated.The residue was crystallized from diisopropyl ether/2-propanol to affordthe title compound as a white powder (224 mg).

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=6.6 Hz), 1.05 (3H, d, J=6.3 Hz),2.01-2.07 (1H, m), 2.22 (1H, d, J=16.7 Hz), 2.31 (3H, s), 2.67 (1H, dd,J=16.7, 7.0 Hz), 3.35-3.54 (3H, m), 3.72-3.77 (1H, m), 3.85-3.91 (1H,m), 4.56 (1H, t, J=5.1 Hz), 7.60 (1H, d, J=2.2 Hz), 7.66 (1H, d, J=2.2Hz), 10.99 (1H, s).

The following compound was prepared from the appropriate startingmaterial in a similar manner to Example 142.

Example 1436-[3-Chloro-4-(3-hydroxybutoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.3 Hz), 1.13 (3H, d, J=6.1 Hz),1.74-1.88 (2H, m), 2.23 (1H, d, J=16.7 Hz), 2.31 (3H, s), 2.67 (1H, dd,J=16.7, 7.0 Hz), 3.33-3.42 (1H, m), 3.82-4.03 (3H, m), 4.53 (1H, d,J=4.9 Hz), 7.60 (1H, d, J=2.2 Hz), 7.66 (1H, d, J=2.2 Hz), 10.99 (1H,s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 98.

Example 1446-{3-Chloro-4-[1-(hydroxymethyl)cyclopropylmethoxy]-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.52-0.55 (4H, m), 1.05 (3H, d, J=7.3 Hz), 2.22 (1H,d, J=16.9 Hz), 2.32 (3H, s), 2.67 (1H, dd, J=16.9, 6.8 Hz), 3.32-3.42(1H, m), 3.53 (2H, d, J=5.6 Hz), 3.80 (2H, s), 4.57 (1H, t, J=5.6 Hz),7.59 (1H, d, J=2.2 Hz), 7.64 (1H, d, J=2.2 Hz), 10.97 (1H, s).

Example 1456-{2,3-Difluoro-4-[1-(hydroxymethyl)cyclopropylmethoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.52-0.54 (4H, m), 1.05 (3H, d, J=7.1 Hz), 2.24 (1H,dd, J=16.9, 3.4 Hz), 2.70 (1H, dd, J=16.9, 6.8 Hz), 3.12-3.20 (1H, m),3.39 (2H, d, J=5.6 Hz), 4.03 (2H, s), 4.67 (1H, t, J=5.6 Hz), 7.04-7.10(1H, m), 7.37 (1H, td, J=8.8, 2.2 Hz), 11.02 (1H, s).

Example 146 Production of6-[3-chloro-2-hydroxy-4-(4-hydroxy-2,2-dimethylbutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

A mixture of6-[3-chloro-4-hydroxy-2-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 99, 250 mg),4-(tert-butyldimethylsilyloxy)-2,2-dimethylbutan-1-ol (214 mg),triphenylphosphine (285 mg), and bis(2-methoxyethyl) azodicarboxylate(255 mg) in THF (10 mL) was stirred at room temperature overnight. Thesolvent was removed, and the residue was purified by silica gel columnchromatography (heptane:ethyl acetate=67:33 to 33:67) to afford amixture containing the desired intermediate. To a mixture of the aboveintermediate in ethanol (2.0 mL) was added hydrogen chloride (2 Methanol solution, 1.0 mL), and the mixture was stirred at roomtemperature overnight. The reaction mixture was filtrated, and thefiltrate was concentrated, and the obtained solid was washed bytrituration with ethyl acetate/heptane to afford the title compound as acolorless solid (28 mg).

¹H-NMR (DMSO-d6) δ: 1.02 (6H, s), 1.10 (3H, d, J=7.6 Hz), 1.57 (2H, t,J=7.6 Hz), 2.29 (1H, d, J=16.9 Hz), 2.80 (1H, dd, J=16.9, 6.8 Hz),3.47-3.60 (3H, m), 3.79 (2H, s), 4.32 (1H, t, J=4.9 Hz), 6.70 (1H, d,J=9.0 Hz), 7.55 (1H, d, J=9.0 Hz), 11.12 (1H, s), 13.00 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 48.

Example 1476-[5-Chloro-2-fluoro-4-(2-hydroxypropoxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 1.19 (3H, d, J=6.2 Hz),2.20-2.29 (4H, m), 2.68 (1H, dd, J=16.8, 6.8 Hz), 3.08-3.19 (1H, m),3.74-3.84 (2H, m), 3.94-4.04 (1H, m), 4.90-4.95 (1H, m), 7.51 (1H, d,J=7.9 Hz), 11.06 (1H, s).

Example 1486-[3-Chloro-2-fluoro-4-(2-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 1.19 (3H, d, J=6.3 Hz), 2.25(1H, dd, J=16.8, 3.7 Hz), 2.29 (3H, s), 2.69 (1H, dd, J=16.8, 6.8 Hz),3.09-3.20 (1H, m), 3.73-3.86 (2H, m), 3.93-4.05 (1H, m), 4.90 (1H, d,J=4.9 Hz), 7.43 (1H, d, J=8.3 Hz), 11.07 (1H, s).

Example 1496-[3-Chloro-2,5-difluoro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 1.18 (3H, d, J=6.2 Hz), 2.26(1H, dd, J=16.9, 3.5 Hz), 2.70 (1H, dd, J=16.9, 6.8 Hz), 3.11-3.23 (1H,m), 3.89-4.12 (3H, m), 4.88 (1H, d, J=4.8 Hz), 7.55 (1H, dd, J=12.3, 7.1Hz), 11.14 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 76.

Example 1506-{2-Fluoro-4-[(Z)-4-hydroxy-2-butenyloxy]-3,5-dimethylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.16 (3H, d, J=2.3 Hz),2.20-2.28 (1H, m), 2.22 (3H, s), 2.66 (1H, dd, J=16.7, 6.7 Hz),3.06-3.16 (1H, m), 3.97-4.07 (2H, m), 4.39-4.46 (2H, m), 4.77 (1H, t,J=5.3 Hz), 5.68-5.79 (2H, m), 7.25 (1H, d, J=8.9 Hz), 10.97 (1H, s).

Example 1516-{3-Chloro-2-fluoro-4-[(Z)-4-hydroxy-2-butenyloxy]-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.1 Hz), 2.22-2.32 (1H, m), 2.27 (3H,s), 2.70 (1H, dd, J=16.8, 6.8 Hz), 3.10-3.19 (1H, m), 3.97-4.07 (2H, m),4.56-4.63 (2H, m), 4.78 (1H, t, J=5.4 Hz), 5.69-5.81 (2H, m), 7.44 (1H,d, J=8.7 Hz), 11.08 (1H, s).

Example 1526-{3-Chloro-2,5-difluoro-4-[(Z)-4-hydroxy-2-butenyloxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 2.26 (1H, dd, J=16.8, 3.6Hz), 2.71 (1H, dd, J=16.8, 6.8 Hz), 3.12-3.23 (1H, m), 3.97-4.05 (2H,m), 4.76-4.86 (3H, m), 5.63-5.82 (2H, m), 7.56 (1H, dd, J=12.0, 7.1 Hz),11.14 (1H, s).

Example 1536-{2-Hydroxy-4-[(Z)-4-hydroxy-2-butenyloxy]-3-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.10 (3H, d, J=7.3 Hz), 2.01 (3H, s), 2.27 (1H, d,J=16.7 Hz), 2.76 (1H, dd, J=16.7, 6.7 Hz), 3.47-3.58 (1H, m), 4.05-4.14(2H, m), 4.65-4.71 (2H, m), 4.81 (1H, t, J=5.3 Hz), 5.60-5.77 (2H, m),6.60 (1H, d, J=8.8 Hz), 7.43 (1H, d, J=8.8 Hz), 11.04 (1H, s), 12.48(1H, s).

Example 1546-(3-Chloro-2-fluoro-4-{[(1S*,2R*)-2-(hydroxymethyl)cyclopropyl]methoxy}phenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.36-0.43 (1H, m), 0.77-0.85 (1H, m), 1.04 (3H, d,J=7.3 Hz), 1.14-1.26 (1H, m), 1.29-1.40 (1H, m), 2.25 (1H, dd, J=16.7,3.5 Hz), 2.69 (1H, dd, J=16.7, 6.8 Hz), 3.09-3.21 (1H, m), 3.46-3.55(2H, m), 4.20 (2H, d, J=7.6 Hz), 4.39-4.47 (1H, m), 7.04-7.10 (1H, m),7.53 (1H, t, J=8.8 Hz), 11.02 (1H, s).

Example 1556-(3-Chloro-4-{[(1S*,2R*)-2-(hydroxymethyl)cyclopropyl]methoxy}-5-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.28-0.35 (1H, m), 0.74-0.83 (1H, m), 1.05 (3H, d,J=7.3 Hz), 1.11-1.23 (1H, m), 1.28-1.40 (1H, m), 2.19-2.27 (1H, m), 2.33(3H, s), 2.67 (1H, dd, J=16.9, 6.8 Hz), 3.33-3.51 (3H, m), 3.82-3.92(1H, m), 4.00-4.09 (1H, m), 4.41 (1H, t, J=5.3 Hz), 7.58-7.62 (1H, m),7.64-7.68 (1H, m), 10.98 (1H, s).

Example 1566-(3-Chloro-2-fluoro-4-{[(1S*,2S*)-2-(hydroxymethyl)cyclopropyl]methoxy}phenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.49-0.58 (2H, m), 0.99-1.20 (5H, m), 2.25 (1H, dd,J=16.9, 3.5 Hz), 2.69 (1H, dd, J=16.9, 6.8 Hz), 3.07-3.20 (1H, m),3.25-3.41 (2H, m), 3.88-3.98 (1H, m), 4.11-4.20 (1H, m), 4.51 (1H, t,J=5.6 Hz), 7.02-7.11 (1H, m), 7.53 (1H, t, J=8.8 Hz), 11.02 (1H, s).

Example 1576-{3-Chloro-2-hydroxy-4-[(Z)-4-hydroxy-2-butenyloxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.11 (3H, d, J=7.3 Hz), 2.26-2.32 (1H, m), 2.80 (1H,dd, J=16.9, 6.6 Hz), 3.49-3.61 (1H, m), 4.08-4.16 (2H, m), 4.75-4.86(3H, m), 5.59-5.69 (1H, m), 5.70-5.80 (1H, m), 6.75 (1H, d, J=9.0 Hz),7.57 (1H, d, J=9.0 Hz), 11.13 (1H, s), 13.02 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 107.

Example 1586-[5-Chloro-4-(2,2-difluoro-3-hydroxypropoxy)-2-fluoro-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.2 Hz), 2.21-2.31 (4H, m), 2.69 (1H,dd, J=16.7, 6.7 Hz), 3.08-3.18 (1H, m), 3.80 (2H, td, J=13.8, 6.1 Hz),4.32 (2H, t, J=13.5 Hz), 5.68 (1H, t, J=6.1 Hz), 7.55 (1H, d, J=7.9 Hz),11.08 (1H, s).

Example 1596-[3-Chloro-4-(2,2-difluoro-3-hydroxypropoxy)-2-fluoro-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 2.26 (1H, dd, J=16.9, 3.8Hz), 2.29 (3H, s), 2.70 (1H, dd, J=16.9, 6.8 Hz), 3.10-3.20 (1H, m),3.81 (2H, td, J=13.9, 6.1 Hz), 4.32 (2H, t, J=13.4 Hz), 5.67 (1H, t,J=6.1 Hz), 7.46 (1H, d, J=8.5 Hz), 11.09 (1H, s).

Example 1606-[4-(2,2-Difluoro-3-hydroxypropoxy)-2-fluoro-3,5-dimethylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.04 (3H, d, J=7.1 Hz), 2.18 (3H, d, J=2.3 Hz),2.237 (1H, dd, J=16.8, 3.7 Hz), 2.238 (3H, s), 2.66 (1H, dd, J=16.8, 6.8Hz), 3.06-3.17 (1H, m), 3.80 (2H, td, J=13.8, 6.1 Hz), 4.14 (2H, t,J=13.3 Hz), 5.68 (1H, t, J=6.1 Hz), 7.27 (1H, d, J=8.8 Hz), 11.00 (1H,s).

Example 1616-[3-Chloro-4-(2,2-difluoro-3-hydroxypropoxy)-2,5-difluorophenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.05 (3H, d, J=7.2 Hz), 2.27 (1H, dd, J=16.9, 3.6Hz), 2.71 (1H, dd, J=16.9, 6.8 Hz), 3.12-3.23 (1H, m), 3.79 (2H, td,J=13.8, 6.2 Hz), 4.55 (2H, t, J=13.1 Hz), 5.68 (1H, t, J=6.2 Hz), 7.61(1H, dd, J=12.2, 7.1 Hz), 11.16 (1H, s).

Example 1626-[3-Chloro-4-(2,2-difluoro-3-hydroxypropoxy)-2-hydroxyphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.10 (3H, d, J=7.3 Hz), 2.29 (1H, d, J=16.8 Hz),2.80 (1H, dd, J=16.8, 6.8 Hz), 3.50-3.62 (1H, m), 3.80 (2H, td, J=13.9,6.4 Hz), 4.46 (2H, t, J=12.5 Hz), 5.68 (1H, t, J=6.4 Hz), 6.83 (1H, d,J=9.3 Hz), 7.60 (1H, d, J=9.3 Hz), 11.16 (1H, s), 13.08 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 74.

Example 1636-[3-Chloro-2-hydroxy-4-(2-hydroxybutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.93 (3H, t, J=7.3 Hz), 1.11 (3H, d, J=7.3 Hz),1.37-1.51 (1H, m), 1.56-1.70 (1H, m), 2.29 (1H, d, J=16.9 Hz), 2.79 (1H,dd, J=16.9, 6.8 Hz), 3.49-3.60 (1H, m), 3.68-3.79 (1H, m), 3.90-4.05(2H, m), 4.85-4.90 (1H, m), 6.75 (1H, d, J=9.3 Hz), 7.55 (1H, d, J=9.3Hz), 11.13 (1H, s), 13.00-13.03 (1H, m).

Example 1646-[3-Chloro-2-hydroxy-4-(2-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 1.11 (3H, d, J=7.3 Hz), 1.19 (3H, d, J=6.2 Hz), 2.25(3H, s), 2.30 (1H, dd, J=16.8, 1.1 Hz), 2.79 (1H, dd, J=16.8, 6.7 Hz),3.51-3.61 (1H, m), 3.68-3.81 (2H, m), 3.93-4.03 (1H, m), 4.84-4.90 (1H,m), 7.46 (1H, s), 11.17 (1H, s), 12.78 (1H, s).

Example 165 Production of6-{3-bromo-5-chloro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of6-(3-bromo-5-chloro-4-hydroxyphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 87, 318 mg) and[1-(tetrahydro-2H-pyran-2-yloxy)cyclopropyl]methanol (207 mg) in THF(5.0 mL) were added triphenylphosphine (315 mg) and bis(2-methoxyethyl)azodicarboxylate (281 mg) at 0° C. The reaction mixture was stirred atroom temperature for one hour, and then the solvent was removed. Theresidue was diluted with ethyl acetate, washed with 1 M aqueous sodiumhydroxide and then brine, dried over anhydrous sodium sulfate,filtrated, and concentrated. The residue was purified by silica gelcolumn chromatography (heptane:ethyl acetate=71:29 to 50:50 to 32:68) toafford a colorless amorphous. The amorphous was dissolved in ethanol(5.0 mL), pyridinium p-toluenesulfonate (23 mg) was added to themixture, and the mixture was stirred at 60° C. for 30 minutes. Thereaction mixture was allowed to cool to room temperature, water wasadded to the reaction mixture, and the mixture was extracted with ethylacetate. The organic layer was washed with 1 M aqueous sodium hydroxideand then brine, dried over anhydrous sodium sulfate, filtrated, and thenconcentrated. The obtained solid was washed by trituration withdiisopropyl ether to afford the title compound as a white solid (282mg).

¹H-NMR (DMSO-d6) δ: 0.67-0.78 (4H, m), 1.04 (3H, d, J=7.3 Hz), 2.23 (1H,d, J=16.8 Hz), 2.69 (1H, dd, J=16.8, 6.9 Hz), 3.36-3.46 (1H, m),3.97-4.03 (2H, m), 5.63 (1H, s), 7.85 (1H, d, J=2.2 Hz), 7.95 (1H, d,J=2.2 Hz), 11.08 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 165.

Example 1666-{2-Hydroxy-4-[(1-hydroxycyclopropyl)methoxy]-3-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.60-0.73 (4H, m), 1.10 (3H, d, J=7.3 Hz), 2.05 (3H,s), 2.26 (1H, d, J=16.7 Hz), 2.76 (1H, dd, J=16.7, 6.7 Hz), 3.47-3.58(1H, m), 3.96-4.05 (2H, m), 5.55 (1H, s), 6.57 (1H, d, J=9.0 Hz), 7.41(1H, d, J=9.0 Hz), 11.02 (1H, s), 12.45 (1H, s).

Example 1676-{3-Chloro-2-fluoro-4-[(1-hydroxycyclopropyl)methoxy]-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.61-0.74 (4H, m), 1.05 (3H, d, J=7.2 Hz), 2.25 (1H,dd, J=16.9, 3.7 Hz), 2.32 (3H, s), 2.69 (1H, dd, J=16.9, 6.8 Hz),3.09-3.19 (1H, m), 3.95 (2H, s), 5.63 (1H, s), 7.39-7.45 (1H, m), 11.06(1H, s).

Example 1686-{3-Bromo-2-fluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.64-0.76 (4H, m), 1.04 (3H, d, J=7.2 Hz), 2.24 (1H,dd, J=16.8, 3.7 Hz), 2.69 (1H, dd, J=16.8, 6.8 Hz), 3.08-3.19 (1H, m),4.15 (2H, s), 5.59 (1H, s), 7.06 (1H, dd, J=9.0, 1.0 Hz), 7.56 (1H, t,J=9.0 Hz), 11.01 (1H, s).

Example 1696-{3-Bromo-5-fluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.65-0.72 (4H, m), 1.04 (3H, d, J=7.3 Hz), 2.23 (1H,d, J=16.8 Hz), 2.69 (1H, dd, J=16.8, 6.9 Hz), 3.35-3.45 (1H, m), 4.09(2H, s), 5.55 (1H, s), 7.66 (1H, dd, J=12.5, 2.1 Hz), 7.81 (1H, t, J=2.1Hz), 11.06 (1H, s).

Example 1706-{3,5-Dichloro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.66-0.75 (4H, m), 1.04 (3H, d, J=7.2 Hz), 2.24 (1H,d, J=16.9 Hz), 2.69 (1H, dd, J=16.9, 7.0 Hz), 3.36-3.47 (1H, m), 4.01(2H, s), 5.61 (1H, s), 7.81 (2H, s), 11.08 (1H, s).

Example 1716-{2-Fluoro-4-[(1-hydroxycyclopropyl)methoxy]-3,5-dimethylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.59-0.71 (4H, m), 1.04 (3H, d, J=7.2 Hz), 2.19 (3H,d, J=2.4 Hz), 2.23 (1H, dd, J=16.8, 3.8 Hz), 2.24 (3H, s), 2.65 (1H, dd,J=16.8, 6.7 Hz), 3.06-3.17 (1H, m), 3.77 (2H, s), 5.65 (1H, s), 7.23(1H, d, J=8.9 Hz), 10.96 (1H, s).

Example 1726-{3-Chloro-2,5-difluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.62-0.72 (4H, m), 1.05 (3H, d, J=7.2 Hz), 2.26 (1H,dd, J=16.8, 3.6 Hz), 2.70 (1H, dd, J=16.8, 6.8 Hz), 3.12-3.21 (1H, m),4.17 (2H, s), 5.54 (1H, s), 7.54 (1H, dd, J=12.1, 7.1 Hz), 11.13 (1H,s).

Example 173 Production of6-[3-chloro-2-hydroxy-4-(3-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of6-[3-chloro-4-hydroxy-2-(methoxymethyloxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 203, 313 mg) and3-(tetrahydro-2H-pyran-2-yloxy)propan-1-ol (208 mg) in THF (5.0 mL) wereadded triphenylphosphine (341 mg) and bis(2-methoxyethyl)azodicarboxylate (304 mg) at 0° C., and then the mixture was stirred atroom temperature for one hour. The solvent was removed, and the residuewas diluted with ethyl acetate. The solution was washed with 1 M aqueoussodium hydroxide and then brine, dried over anhydrous sodium sulfate,filtrated, and then concentrated. The obtained crude product waspurified by silica gel column chromatography (heptane:ethylacetate=61:39 to 40:60 to 33:67) to afford a colorless amorphous. Theamorphous was dissolved in ethanol (5.0 mL), and hydrogen chloride (2 Methanol solution, 1.0 mL) was added to the mixture. The mixture wasstirred at room temperature for one hour. To the reaction mixture wasadded water, and the precipitates were collected on a filter, and driedto afford the title compound as a white solid (256 mg).

¹H-NMR (DMSO-d6) δ: 1.11 (3H, d, J=7.3 Hz), 1.85-1.96 (2H, m), 2.23 (3H,s), 2.30 (1H, d, J=16.8 Hz), 2.79 (1H, dd, J=16.8, 6.7 Hz), 3.50-3.67(3H, m), 3.98 (2H, t, J=6.5 Hz), 4.51 (1H, t, J=5.1 Hz), 7.46 (1H, s),11.17 (1H, s), 12.77 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 173.

Example 1746-{3-Chloro-2-hydroxy-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.62-0.74 (4H, m), 1.11 (3H, d, J=7.3 Hz), 2.29 (1H,d, J=16.8 Hz), 2.80 (1H, dd, J=16.8, 6.8 Hz), 3.50-3.60 (1H, m),4.07-4.15 (2H, m), 5.57 (1H, s), 6.76 (1H, d, J=9.2 Hz), 7.55 (1H, d,J=9.2 Hz), 11.12 (1H, s), 13.01 (1H, s).

Example 1756-{3-Chloro-2-hydroxy-4-[(1-hydroxycyclopropyl)methoxy]-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.62-0.74 (4H, m), 1.12 (3H, d, J=7.3 Hz), 2.29 (3H,s), 2.30 (1H, dd, J=16.9, 1.3 Hz), 2.79 (1H, dd, J=16.9, 6.7 Hz),3.51-3.62 (1H, m), 3.87-3.94 (2H, m), 5.61 (1H, s), 7.46 (1H, s), 11.16(1H, s), 12.76 (1H, s).

Example 1766-{5-Chloro-2-hydroxy-4-[(1-hydroxycyclopropyl)methoxy]-3-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

¹H-NMR (DMSO-d6) δ: 0.61-0.73 (4H, m), 1.10 (3H, d, J=7.3 Hz), 2.19 (3H,s), 2.27 (1H, dd, J=16.9, 1.2 Hz), 2.77 (1H, dd, J=16.9, 6.7 Hz),3.50-3.60 (1H, m), 3.88 (2H, s), 5.64 (1H, s), 7.53 (1H, s), 11.17 (1H,s), 12.58 (1H, s).

Example 177 Production of6-[4-(1,1-difluoro-2-hydroxyethoxy)-2-fluoro-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of6-(2-fluoro-4-hydroxy-5-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 205, 472 mg) and ethyl bromodifluoroacetate (0.385mL) in DMF (10 mL) was added potassium carbonate (415 mg) at 0° C. Themixture was gradually warmed to room temperature, and stirred overnight.To the reaction mixture was added water, and the mixture was extractedwith ethyl acetate. The organic layer was washed with water and brine,dried over anhydrous sodium sulfate, filtrated, and then concentrated.The residue was purified by silica gel column chromatography(heptane:ethyl acetate=68:32 to 47:53 to 40:60) to afford a colorlessamorphous. The amorphous was dissolved in THF (6.0 mL), and lithiumborohydride (44 mg) was added to the mixture at 0° C. The reactionmixture was stirred at room temperature for one hour. To the reactionmixture was added water, and the mixture was extracted with ethylacetate. The organic layer was washed with brine, dried over anhydroussodium sulfate, filtrated, and then concentrated. The obtained crudeproduct was purified by silica gel column chromatography (heptane:ethylacetate=53:47 to 32:68 to 29:71), and the desired fractions wereconcentrated. The residue was washed by trituration with diisopropylether to afford the title compound as a white solid (44 mg).

¹H-NMR (DMSO-d6) δ: 1.06 (3H, d, J=7.2 Hz), 2.21-2.29 (1H, m), 2.22 (3H,s), 2.69 (1H, dd, J=16.8, 6.8 Hz), 3.11-3.21 (1H, m), 3.85-3.96 (2H, m),5.94 (1H, t, J=6.7 Hz), 7.14 (1H, d, J=11.7 Hz), 7.54 (1H, d, J=8.5 Hz),11.06 (1H, s).

Each absolute configuration of Examples 178-183 shown below wasextrapolated by comparison with Example 116.

Example 178 Production of(5R)-(−)-6-[2-hydroxy-4-(3-hydroxypropoxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

6-[4-(3-Hydroxypropoxy)-2-(methoxymethyloxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 228, 695 mg) was optically-resolved by chiral columnchromatography according to the following preparative condition toafford chiral6-[4-(3-hydroxypropoxy)-2-(methoxymethyloxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-oneas a colorless amorphous (322 mg, 99% ee).

<Preparative Condition>

Column: Daicel CHIRALFLASH IA (3.0 cmφ×10 cm)

Eluent: hexane/ethanol=80/20

Flow rate: 15 ml/min

Detection: UV (254 nm).

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK IA (0.46 cmφ×25 cm)

Eluent: hexane/ethanol=40/60

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 4.7 min

¹H-NMR (CDCl₃) δ: 1.06 (3H, d, J=7.3 Hz), 1.77-1.85 (1H, m), 2.09 (2H,quintet, J=6.0 Hz), 2.19 (3H, s), 2.41 (1H, dd, J=17.1, 4.6 Hz), 2.78(1H, dd, J=17.1, 7.0 Hz), 3.28-3.37 (1H, m), 3.50 (3H, s), 3.87-3.91(2H, m), 4.15 (2H, t, J=6.0 Hz), 4.88 (1H, d, J=5.6 Hz), 4.98 (1H, d,J=5.6 Hz), 6.70 (1H, d, J=8.5 Hz), 7.14 (1H, d, J=8.5 Hz), 8.56 (1H,brs).

To a mixture of the above-obtained chiral6-[4-(3-hydroxypropoxy)-2-(methoxymethyloxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(291 mg) in ethanol (1.5 mL) was added hydrogen chloride (2 M ethanolsolution, 0.865 mL), and then the mixture was stirred at roomtemperature for one hour. The precipitated solid was collected on afilter, and then recrystallized from 2-propanol to afford the titlecompound as a white solid (182 mg, >99% ee).

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK AS-RH (0.46 cmφ×15 cm)

Eluent: acetonitrile/water=40/60

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 5.2 min

Optical rotation: [α]_(D) ³¹ −332.1° (c=0.26, MeOH)

¹H-NMR (DMSO-d6) δ: 1.10 (3H, d, J=7.3 Hz), 1.84-1.92 (2H, m), 2.01 (3H,s), 2.27 (1H, dd, J=16.9, 1.3 Hz), 2.76 (1H, dd, J=16.9, 6.6 Hz),3.48-3.61 (3H, m), 4.08 (2H, t, J=6.2 Hz), 4.55 (1H, t, J=5.1 Hz), 6.59(1H, d, J=9.0 Hz), 7.43 (1H, d, J=9.0 Hz), 11.03 (1H, s), 12.46 (1H, s).

The following compounds were prepared from each appropriate startingmaterial in a similar manner to Example 178.

Example 179(5R)-(−)-6-[2-hydroxy-4-(2-hydroxy-2-methylpropoxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Chiral6-[4-(2-hydroxy-2-methylpropoxy)-2-(methoxymethyloxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Optical purity: 98% ee

<HPLC Conditions of Optical Purity Aanalysis>

Column: Daicel CHIRALPAK IA (0.46 cmφ×25 cm)

Eluent: hexane/ethanol=50/50

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 5.6 min

¹H-NMR (CDCl₃) δ: 1.07 (3H, d, J=7.3 Hz), 1.38 (6H, s), 2.16 (1H, s),2.24 (3H, s), 2.41 (1H, dd, J=17.1, 4.6 Hz), 2.79 (1H, dd, J=17.1, 6.8Hz), 3.28-3.38 (1H, m), 3.51 (3H, s), 3.82 (2H, s), 4.89 (1H, d, J=5.6Hz), 5.00 (1H, d, J=5.6 Hz), 6.67 (1H, d, J=8.5 Hz), 7.14 (1H, d, J=8.5Hz), 8.46 (1H, brs).

(5R)-(−)-6-[2-hydroxy-4-(2-hydroxy-2-methylpropoxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Optical purity: 98% ee

<HPLC Conditions of Optical Purity Aanalysis>

Column: Daicel CHIRALPAK AS-RH (0.46 cmφ×15 cm)

Eluent: acetonitrile/water=35/75

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 7.5 min

Optical rotation: [α]_(D) ³¹ −312.2° (c=0.24, MeOH)

¹H-NMR (DMSO-d6) δ: 1.10 (3H, d, J=7.3 Hz), 1.23 (6H, s), 2.05 (3H, s),2.23-2.31 (1H, m), 2.76 (1H, dd, J=16.7, 6.7 Hz), 3.47-3.57 (1H, m),3.74 (2H, s), 4.65 (1H, s), 6.55 (1H, d, J=9.0 Hz), 7.42 (1H, d, J=9.0Hz), 11.03 (1H, s), 12.46 (1H, s).

Example 180(5R)-(−)-6-[3-chloro-2-hydroxy-4-(4-hydroxybutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Chiral6-[3-chloro-4-(4-hydroxybutoxy)-2-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Optical purity: >99% ee

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK IA (0.46 cmφ×25 cm)

Eluent: hexane/ethanol=15/85

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 4.6 min

¹H-NMR (CDCl₃) δ: 1.07 (3H, d, J=7.3 Hz), 1.50-1.54 (1H, m), 1.77-1.85(2H, m), 1.94-2.01 (2H, m), 2.42 (1H, dd, J=17.0, 4.8 Hz), 2.80 (1H, dd,J=17.0, 7.0 Hz), 3.32-3.40 (1H, m), 3.53 (3H, s), 3.74-3.79 (2H, m),4.11 (2H, t, J=6.1 Hz), 5.01 (1H, d, J=5.6 Hz), 5.16 (1H, d, J=5.6 Hz),6.77 (1H, d, J=8.8 Hz), 7.21 (1H, d, J=8.8 Hz), 8.45 (1H, brs).

(5R)-(−)-6-[3-chloro-2-hydroxy-4-(4-hydroxybutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Optical purity: >99% ee

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK AS-RH (0.46 cmφ×15 cm)

Eluent: acetonitrile/water=40/60

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 4.7 min

Optical rotation: [α]_(D) ³¹ −305.4° (c=0.24, MeOH)

¹H-NMR (DMSO-d6) δ: 1.11 (3H, d, J=7.3 Hz), 1.53-1.64 (2H, m), 1.73-1.84(2H, m), 2.25-2.34 (1H, m), 2.79 (1H, dd, J=16.9, 6.8 Hz), 3.42-3.50(2H, m), 3.50-3.60 (1H, m), 4.12 (2H, t, J=6.4 Hz), 4.46 (1H, t, J=5.1Hz), 6.73 (1H, d, J=9.0 Hz), 7.56 (1H, d, J=9.0 Hz), 11.13 (1H, brs),13.01 (1H, brs).

Example 181(5R)-(−)-6-[3-chloro-2-hydroxy-4-(3-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Chiral6-[3-chloro-4-(3-hydroxypropoxy)-2-(methoxymethyloxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Optical purity: >99% ee

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK IA (0.46 cmφ×25 cm)

Eluent: hexane/ethanol=25/75

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 3.9 min

¹H-NMR (CDCl₃) δ: 1.08 (3H, d, J=7.6 Hz), 1.90 (1H, t, J=5.5 Hz),2.07-2.13 (2H, m), 2.30 (3H, d, J=0.7 Hz), 2.42 (1H, dd, J=17.0, 4.9Hz), 2.80 (1H, dd, J=17.0, 7.0 Hz), 3.30-3.39 (1H, m), 3.52 (3H, s),3.97 (2H, td, J=5.9, 5.5 Hz), 4.09 (2H, t, J=5.9 Hz), 4.98 (1H, d, J=5.4Hz), 5.12 (1H, d, J=5.4 Hz), 7.08 (1H, d, J=0.7 Hz), 8.49 (1H, s).

(5R)-(−)-6-[3-chloro-2-hydroxy-4-(3-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

Optical purity: 96% ee

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK AS-RH (0.46 cmφ×15 cm)

Eluent: acetonitrile/water=40/60

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 4.7 min

Optical rotation: [α]_(D) ³¹ −286.0° (c=0.23, MeOH)

¹H-NMR (DMSO-d6) δ: 1.11 (3H, d, J=7.3 Hz), 1.85-1.96 (2H, m), 2.23 (3H,s), 2.30 (1H, d, J=16.8 Hz), 2.79 (1H, dd, J=16.8, 6.7 Hz), 3.50-3.67(3H, m), 3.98 (2H, t, J=6.5 Hz), 4.51 (1H, t, J=5.1 Hz), 7.46 (1H, s),11.17 (1H, s), 12.77 (1H, s).

Example 182 Production of(5R)-(−)-6-[3-chloro-2-hydroxy-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

6-[3-Chloro-4-(2-hydroxy-2-methylpropoxy)-2-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 212, 525 mg) was optically-resolved by chiral columnchromatography according to the following preparative condition toafford chiral6-[4-(3-hydroxypropoxy)-2-(methoxymethyloxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-oneas a colorless amorphous (220 mg, 99% ee).

<Preparative Condition>

Column: Daicel CHIRALFLASH IA (3.0 cmφ×10 cm)

Eluent: hexane/ethanol=75/25

Flow rate: 15 ml/min

Detection: UV (254 nm).

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK IA (0.46 cmφ×25 cm)

Eluent: hexane/ethanol=40/60

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 5.2 min

¹H-NMR (CDCl₃) δ: 1.07 (3H, d, J=7.3 Hz), 1.39 (6H, s), 2.42 (1H, dd,J=17.0, 4.8 Hz), 2.80 (1H, dd, J=17.0, 7.0 Hz), 3.30-3.41 (1H, m), 3.53(3H, s), 3.87 (2H, s), 5.01-5.06 (1H, m), 5.14-5.20 (1H, m), 6.76 (1H,d, J=8.5 Hz), 7.22 (1H, d, J=8.5 Hz), 8.44 (1H, brs).

To a mixture of the above-obtained chiral6-[4-(3-hydroxypropoxy)-2-(methoxymethyloxy)-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(164 mg) in ethanol (1.0 mL) was added hydrogen chloride (2 M ethanolsolution, 0.442 mL), and then the mixture was stirred at roomtemperature for one hour. The precipitates were collected on a filter,and then recrystallized from 2-propanol to afford the title compound asa white solid (57 mg, 99% ee).

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK AS-RH (0.46 cmφ×15 cm)

Eluent: acetonitrile/water=35/65

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 6.5 min

Optical rotation: [α]_(D) ³⁰ −291.0° (c=0.26, MeOH)

¹H-NMR (DMSO-d6) δ: 1.11 (3H, d, J=7.3 Hz), 1.24 (6H, s), 2.25-2.34 (1H,m), 2.81 (1H, dd, J=17.0, 6.7 Hz), 3.48-3.60 (1H, m), 3.83 (2H, s), 4.67(1H, brs), 6.73 (1H, d, J=9.3 Hz), 7.56 (1H, d, J=9.3 Hz), 11.13 (1H,s), 13.01 (1H, s).

Example 183 Production of(5R)-(−)-6-{3-chloro-2-hydroxy-4-[(Z)-4-hydroxy-2-butenyloxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one

6-[3-Chloro-4-[(Z)-4-hydroxy-2-butenyloxy]-2-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 229, 497 mg) was optically-resolved by chiral columnchromatography according to the following preparative condition toafford chiral6-[3-chloro-4-[(Z)-4-hydroxy-2-butenyloxy]-2-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-oneas a colorless amorphous (232 mg, >99% ee).

<Preparative Condition>

Column: Daicel CHIRALFLASH IA (3.0 cmφ×10 cm)

Eluent: hexane/ethanol=70/30

Flow rate: 15 ml/min

Detection: UV (254 nm).

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK IA (0.46 cmφ×25 cm)

Eluent: hexane/ethanol=20/80

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 4.6 min

¹H-NMR (CDCl₃) δ: 1.07 (3H, d, J=7.3 Hz), 1.63-1.68 (1H, m), 2.42 (1H,dd, J=17.0, 4.8 Hz), 2.80 (1H, dd, J=17.0, 7.0 Hz), 3.31-3.40 (1H, m),3.53 (3H, s), 4.29-4.35 (2H, m), 4.72-4.77 (2H, m), 5.02 (1H, d, J=5.6Hz), 5.16 (1H, d, J=5.6 Hz), 5.83-5.96 (2H, m), 6.78 (1H, d, J=8.5 Hz),7.22 (1H, d, J=8.5 Hz), 8.52 (1H, s).

To a mixture of the above-obtained chiral6-[3-chloro-4-[(Z)-4-hydroxy-2-butenyloxy]-2-(methoxymethyloxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(204 mg) in ethanol (1.0 mL) was added hydrogen chloride (2 M ethanolsolution, 0.442 mL), and then the mixture was stirred at roomtemperature for one hour. The precipitates were collected on a filter,and then recrystallized from hexane/2-propanol to afford the titlecompound as a white solid (54 mg, 93% ee).

<HPLC Conditions of Optical Purity Analysis>

Column: Daicel CHIRALPAK AS-RH (0.46 cmφ×15 cm)

Eluent: acetonitrile/water=35/65

Flow rate: 1.0 ml/min

Detection: UV (254 nm).

Retention time: 6.5 min

Optical rotation: [α]_(D) ³¹ −274.0° (c=0.23, MeOH)

¹H-NMR (DMSO-d6) δ: 1.11 (3H, d, J=7.3 Hz), 2.26-2.32 (1H, m), 2.80 (1H,dd, J=16.9, 6.6 Hz), 3.49-3.61 (1H, m), 4.08-4.16 (2H, m), 4.75-4.86(3H, m), 5.59-5.69 (1H, m), 5.70-5.80 (1H, m), 6.75 (1H, d, J=9.0 Hz),7.57 (1H, d, J=9.0 Hz), 11.13 (1H, s), 13.02 (1H, s).

Example 184 Production of6-[2-fluoro-4-(2-hydroxy-2-methylpropoxy)-3-(trifluoromethyl)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one

To a mixture of6-[2-fluoro-4-hydroxy-3-(trifluoromethyl)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one(Reference example 242, 290 mg) in DMF (5.0 mL) were added potassiumcarbonate (207 mg) and 3-chloro-2-methyl-1-propene (0.117 mL), and thenthe mixture was stirred at 80° C. for one hour.3-Chloro-2-methyl-1-propene (0.029 mL) was added to the reactionmixture, and then the reaction mixture was stirred at 80° C. further for30 minutes. The reaction mixture was allowed to cool to roomtemperature, water was added to the reaction mixture, and then themixture was extracted with ethyl acetate. The organic layer was washedwith 1 M aqueous sodium hydroxide and then brine, dried over anhydroussodium sulfate, filtrated, and then concentrated. The obtained solid waswashed by trituration with diisopropyl ether to afford a white solid(276 mg). The white solid (242 mg) was dissolved in methylene chloride(3.5 mL), m-chloroperbenzoic acid (280 mg) was added to the solution at0° C. The reaction mixture was stirred at room temperature for 3 hours.Aqueous sodium thiosulfate was added to the reaction mixture at 0° C.,and the mixture was extracted with ethyl acetate. The organic layer waswashed with saturated aqueous sodium bicarbonate and then brine, driedover anhydrous sodium sulfate, filtrated, and then concentrated. Theresidue was purified by silica gel column chromatography (heptane:ethylacetate=47:53 to 26:74 to 12:88), and the obtained solid was washed bytrituration with diisopropyl ether to afford a white solid (163 mg). Amixture of the white solid (140 mg), ammonium formate (74 mg), andpalladium-carbon (10% w/w, 14 mg) in ethanol (7.0 mL) was allowed to beunder a hydrogen atmosphere, and the mixture was stirred at roomtemperature for 3 hours. The mixture was filtered through a Celite pad,and the filtrate was concentrated. The residual solid was washed bytrituration with diisopropyl ether, and then collected on a filter toafford the title compound as a white solid (108 mg).

¹H-NMR (DMSO-d6) δ: 1.03 (3H, d, J=7.2 Hz), 1.21 (6H, s), 2.25 (1H, dd,J=16.8, 4.2 Hz), 2.69 (1H, dd, J=16.8, 6.7 Hz), 3.06-3.17 (1H, m), 3.88(2H, s), 4.72 (1H, s), 7.17 (1H, d, J=9.0 Hz), 7.76-7.83 (1H, m), 11.05(1H, s).

(Test)

The growth inhibitory activity against human childhood brain tumor celllines (PFSK-1) was measured with WST-8 reagent[2-(2-methoxy-4-nitrophenyl)-3-(4-nitrophenyl)-5-(2,4-disulfophenyl)-2H-tetrazoliummonosodium salt, Cell Counting Kit-8™], according to the methoddescribed in Tominaga, H. et al., Anal. Commun., 1999, 36, 47-50.Briefly, PFSK-1 was seeded in 96-well microplate at 100 μL/well withRoswell Park Memorial Institute (RPMI) 1640 medium containing 10% fetalbovine serum (FBS), and the cells were incubated in the presence of 5%carbon dioxide (CO₂) at 37° C. for 24 hours. 50 μL of each test compounddiluted with the medium was added to each well, and then the cells wereincubated further for 3 days. After the incubation, 15 μL of CellCounting Kit-8™ was added to each well, and the cells were incubated forone and half hours. Then, optical density (OD) values at measurementwavelength 450 nm and reference wavelength 630 nm were measured and thedifference thereof was calculated. From the calculated difference, theOD value difference (at measurement wavelength 450 nm and referencewavelength 630 nm) of the control well which includes no cell wassubtracted to afford cell-growth activity in each well.

The cell growth inhibitory activity of each test compound was calculatedby comparing the cell-growth activity with each test compound to thecell-growth activity without any test compound (control), and each IC50(nM) which is the concentration inhibiting 50% of the cell growth wascalculated. The results are shown in the table below.

Exam- IC50 Exam- IC50 Exam- IC50 Exam- IC50 ple (nM) ple (nM) ple (nM)ple (nM) 1 1.1 2 1.0 6 3.8 7 1.0 8 7.9 9 4.2 10 3.7 11 3.0 12 1.9 14 8.015 4.0 16 3.6 17 2.9 18 4.0 19 1.3 20 4.2 21 4.0 22 1.9 23 8.0 24 1.7 252.6 26 2.0 28 6.3 31 1.1 32 4.0 33 5.1 34 5.2 35 6.3 36 1.0 37 8.8 385.2 39 2.8 40 1.6 43 4.3 44 1.0 45 7.2 46 3.9 47 2.4 48 0.9 49 2.8 502.9 51 5.5 52 3.8 53 1.9 54 0.5 55 1.9 56 7.6 57 <1.0 58 2.8 59 2.2 604.7 61 4.7 62 8.9 63 5.0 64 2.1 65 4.3 66 4.1 67 3.6 69 1.2 70 5.3 713.9 72 0.9 74 4.1 75 3.2 76 2.7 77 5.3 78 6.6 79 5.6 80 5.1 81 4.7 826.0 83 6.6 84 3.3 85 4.0 86 4.6 87 9.8 88 9.5 89 4.9 90 3.9 91 6.0 924.9 93 3.1 94 3.0 95 3.0 96 3.9 97 8.6 98 3.6 99 <1.0 100 1.6 101 7.5102 3.4 103 2.6 104 5.2 105 9.0 106 6.4 108 4.1 109 1.6 110 7.8 111 3.0112 2.3 113 1.1 114 3.3 115 5.9 116 4.3 117 3.0 118 <1.0 119 2.9 120 2.4121 3.8 122 4.1 123 3.3 124 2.3 125 1.5 126 2.9 127 <1.0 129 3.6 130 7.0131 1.0 132 3.0 133 3.4 134 7.1 135 6.8 136 5.2 137 <1.0 138 3.9 139 2.7140 2.0 141 4.6 142 1.0 143 6.9 144 4.2 145 7.1 146 6.8 147 7.6 148 <1.0149 3.6 150 5.7 151 1.3 152 3.4 153 5.3 154 2.9 155 2.2 156 2.9 158 4.3159 <1.0 160 1.9 161 2.7 162 6.4 163 5.2 164 4.9 165 2.6 166 4.7 167 1.3168 2.3 169 4.0 170 2.5 171 6.3 172 5.2 174 4.2 175 4.1 176 9.2 177 4.0178 4.6 179 3.3 180 6.5 181 3.9 182 2.9 183 4.5 184 2.2

1. A compound of formula (1):

or a pharmaceutically acceptable salt thereof wherein R¹ to R⁴ areindependently hydrogen atom, halogen, OH, CN, C₁₋₆ alkyl group,halogenated C₁₋₆ alkyl group, C₂₋₆ alkenyl group, C₁₋₆ alkoxy group, orhalogenated C₁₋₆ alkoxy group, provided that one or two of R¹ to R⁴ arehydrogen atoms, but it is not that all of three or four thereof arehydrogen atoms, and Y is C₁₋₆ alkylene or C₂₋₆ alkenylene group, whereinthe alkylene or alkenylene group may be substituted with one or moresubstituents selected independently from the group consisting of C₁₋₆alkyl group, halogen, and halogenated C₁₋₆ alkyl group, further whereina substitutable carbon atom in the substituent bonding to the alkyleneor alkenylene group and another substitutable carbon atom in thealkylene or alkenylene group, or two substitutable carbon atoms in thesubstituent bonding to the alkylene or alkenylene group may be combinedtogether to form a 3- to 6-membered carbon ring.
 2. The compound ofclaim 1 or a pharmaceutically acceptable salt thereof, wherein any twoof R¹ to R⁴ are hydrogen atoms.
 3. The compound of claim 1 or apharmaceutically acceptable salt thereof, wherein R¹ to R⁴ areindependently hydrogen atom, halogen, OH, CN, C₁₋₄ alkyl group,halogenated C₁₋₄ alkyl group, C₂₋₄ alkenyl group, C₁₋₄ alkoxy group, orhalogenated C₁₋₄ alkoxy group.
 4. The compound of claim 1 or apharmaceutically acceptable salt thereof, wherein R¹ to R⁴ areindependently hydrogen atom, fluorine atom, chlorine atom, OH, CN, C₁₋₄alkyl group, vinyl group, or C₁₋₄ alkoxy group.
 5. The compound of claim1 or a pharmaceutically acceptable salt thereof, wherein the alkylene oralkenylene group in Y is substituted with one or more substituentsselected independently from the group consisting of C₁₋₄ alkyl group,halogen, and halogenated C₁₋₄ alkyl group, further wherein asubstitutable carbon atom in the substituent bonding to the alkylene oralkenylene group and another substitutable carbon atom in the alkyleneor alkenylene group, or two substitutable carbon atoms in thesubstituent bonding to the alkylene or alkenylene group may be combinedtogether to form a 3- to 6-membered carbon ring.
 6. The compound ofclaim 1 or a pharmaceutically acceptable salt thereof, wherein a carbonatom of the alkylene or alkenylene group in Y is substituted with one ortwo substituents selected independently from the group consisting ofC₁₋₄ alkyl group and halogenated C₁₋₄ alkyl group, further when thecarbon atom is substituted with two substituents, each substitutablecarbon atom in the two substituents may be combined together to form a3- to 6-membered carbon ring.
 7. The compound of claim 1 or apharmaceutically acceptable salt thereof, wherein the alkylene oralkenylene group in Y has no substituent.
 8. The compound of claim 1 ora pharmaceutically acceptable salt thereof, wherein the compound offormula (1) is represented in the following formula:


9. The compound of claim 1 or a pharmaceutically acceptable saltthereof, which is selected from the following compounds: Example 1:6-[3-bromo-5-chloro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 2:6-[3,5-dichloro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 7:6-[3-chloro-5-fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 12:6-[3-bromo-2-fluoro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 19:6-[3-chloro-2-fluoro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 22:6-[3-chloro-2-fluoro-4-(3-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 24:6-[3-bromo-2-fluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 26:6-[3-bromo-5-fluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 31:6-[3-chloro-4-(2-hydroxy-2-methylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 36:6-[3-chloro-2-fluoro-4-(2-hydroxy-2-methylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 40:6-{3-chloro-4-[(2R)-2-hydroxypropoxy]-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 44:6-{3-chloro-4-[(1-hydroxycyclopropyl)methoxy]-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 47:6-{3-chloro-2-fluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 48:6-[3-bromo-2-fluoro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 53:6-[3,5-dichloro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 54:6-[3-chloro-2-fluoro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 55:6-[3-chloro-4-(2-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 57:6-[3-bromo-5-chloro-4-(2-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 59:6-[2-fluoro-4-(2-hydroxypropoxy)-3-vinylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 64:6-[3-chloro-2-fluoro-4-(2-hydroxybutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 69:6-[3-bromo-5-fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 72:6-[3-chloro-4-(3-hydroxy-2,2-dimethylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 99:6-[3-chloro-5-fluoro-4-(4-hydroxy-2,2-dimethylbutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 100:6-[3,5-dichloro-4-(4-hydroxy-2,2-dimethylbutoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 109:6-[3,5-dichloro-4-(2,2-difluoro-3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 112:6-[3-bromo-4-(2,2-difluoro-3-hydroxypropoxy)-2-fluorophenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 113:6-[3-chloro-4-(2,2-difluoro-3-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 118:(5R)-(−)-6-[3-chloro-2-fluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 120:(5R)-(−)-6-[4-(2,2-difluoro-3-hydroxypropoxy)-2-fluoro-3-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 124:(5R)-(−)-6-[2,3-difluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 125:(5R)-(−)-6-[3-fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 127:(5R)-(−)-6-[3-bromo-5-chloro-4-(3-hydroxy-2,2-dimethylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 131:6-[3-chloro-2,5-difluoro-4-(2-hydroxy-2-methylpropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 137:6-[3-chloro-2-fluoro-4-(3-hydroxy-2,2-dimethylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 140:6-[3-chloro-2,5-difluoro-4-(3-hydroxypropoxy)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 142:6-[3-chloro-4-(3-hydroxy-2-methylpropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 148:6-[3-chloro-2-fluoro-4-(2-hydroxypropoxy)-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 151:6-{3-chloro-2-fluoro-4-[(Z)-4-hydroxy-2-butenyloxy]-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 155:6-(3-chloro-4-{[(1S*,2R*)-2-(hydroxymethyl)cyclopropyl]methoxy}-5-methylphenyl)-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 159:6-[3-chloro-4-(2,2-difluoro-3-hydroxypropoxy)-2-fluoro-5-methylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 160:6-[4-(2,2-difluoro-3-hydroxypropoxy)-2-fluoro-3,5-dimethylphenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 167:6-{3-chloro-2-fluoro-4-[(1-hydroxycyclopropyl)methoxy]-5-methylphenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 168:6-{3-bromo-2-fluoro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one,Example 170:6-{3,5-dichloro-4-[(1-hydroxycyclopropyl)methoxy]phenyl}-5-methyl-4,5-dihydro-2H-pyridazin-3-one,and Example 184:6-[2-fluoro-4-(2-hydroxy-2-methylpropoxy)-3-(trifluoromethyl)phenyl]-5-methyl-4,5-dihydro-2H-pyridazin-3-one.10. An agent for treating malignant tumor, comprising the compound ofclaim 1 or a pharmaceutically acceptable salt thereof.